Question: The 2014 WEC 6 Hours of Spa-Francorchamps had a winning team that included the Swiss driver who previously competed for which team in Formula One?

Context paragraphs:
2017 6 Hours of Nürburgring: The 2017 6 Hours of Nürburgring (formally the WEC 6 Hours of Nürburgring) was an endurance sports car racing event held at the Nürburgring, Nürburg, Germany on 16 July 2017.

2015 6 Hours of Spa-Francorchamps: The 2015 6 Hours of Spa-Francorchamps, formally the WEC 6 Heures de Spa-Francorchamps, was an endurance sports car racing event held on 2 May at the Circuit de Spa-Francorchamps in Stavelot, Belgium.  Spa-Francorchamps hosted the second race of the 2015 FIA World Endurance Championship with 54,000 people attending the race weekend.

2016 6 Hours of Spa-Francorchamps: The 2016 WEC 6 Hours of Spa-Francorchamps, formally the WEC 6 Heures de Spa-Francorchamps, was an endurance sports car racing event held at the Circuit de Spa-Francorchamps, Stavelot, Belgium on 5–7 May 2016.  Spa-Francorchamps served as the second race of the 2016 FIA World Endurance Championship, and was the fifth running of the event as part of the championship.  56,000 people attended the race.

2017 6 Hours of Spa-Francorchamps: The 2017 WEC 6 Hours of Spa-Francorchamps, formally the WEC 6 Heures de Spa-Francorchamps, was an endurance sports car racing event held at the Circuit de Spa-Francorchamps, Stavelot, Belgium on 4-6 May 2017.  Spa-Francorchamps served as the second race of the 2017 FIA World Endurance Championship, and was the sixth running of the event as part of the championship.

2014 6 Hours of Spa-Francorchamps: The 2014 WEC 6 Hours of Spa-Francorchamps, formally known as the WEC 6 Heures de Spa-Francorchamps, was an endurance sports car racing event held at the Circuit de Spa-Francorchamps, Spa, Belgium on 2–3 May 2014.  Spa-Francorchamps served as the second race of the 2014 FIA World Endurance Championship.  Toyota's Anthony Davidson, Sébastien Buemi, and Nicolas Lapierre led the field to the checkered flag for their second consecutive victory of the season, ahead of Audi and the sister Toyota.  The LMP2 category also had its second consecutive winner with G-Drive Racing ahead of Jota Sport's guest entry in the series.  AF Corse Ferrari held off Porsche Team Manthey in the LMGTE Pro class, while another AF Corse Ferrari won the LMGTE Am category ahead of two Aston Martins.

2013 6 Hours of Spa-Francorchamps: The 2013 WEC 6 Hours of Spa-Francorchamps was an endurance race held at Circuit de Spa-Francorchamps, Belgium on 3—4 May 2013, and the annual running of the 6 Hours of Spa-Francorchamps.  It was the second round of the 2013 FIA World Endurance Championship season.  Defending World Champions André Lotterer, Benoît Tréluyer and Marcel Fässler led a clean sweep of the overall race podium for Audi, while Pecom Racing were victorious in the LMP2 category.  The No. 51 car of AF Corse won the LMGTE Pro class, and 8 Star Motorsports won in LMGTE Am.

Sébastien Buemi: Sébastien Olivier Buemi (born 31 October 1988) is a Swiss professional racing driver, who formerly competed for Scuderia Toro Rosso in Formula One.  Buemi is currently a reserve driver for Scuderia Toro Rosso's sister team, Red Bull Racing, as well as being a member of Toyota's FIA World Endurance Championship squad and e.dams Renault in the FIA Formula E Championship.  Along with teammate Anthony Davidson, Buemi became World Champion in the LMP1 class of the FIA World Endurance Championship, in 2014.  He won the second ever Formula E championship, the season held across 2015–2016, by two points for setting the fastest lap time in the final race despite not finishing the event.

2012 6 Hours of Spa-Francorchamps: The 2012 WEC 6 Hours of Spa-Francorchamps was held at Circuit de Spa-Francorchamps on May 5, 2012.  It was the second round of the 2012 FIA World Endurance Championship season.  Following the cancellation of the Zolder round of 2012 European Le Mans Series season, some ELMS teams were invited to enter the race.  Two major entries on the original entry list withdrew from the event before the race week: the No.7 Toyota TS030 Hybrid due to a testing accident, and the new Pescarolo 03 of Pescarolo Team, due to a delay in production.

Narain Karthikeyan: Kumar Ram Narain Karthikeyan (born 14 January 1977, in Coimbatore) is a racing driver who was the first Formula One driver from India.  He has previously competed in A1GP, and the Le Mans Series.  He made his Formula One debut in with the Jordan team, and was a Williams F1 test driver in and .  Like several other former F1 drivers, Karthikeyan moved to stock car racing and drove the #60 Safe Auto Insurance Company Toyota Tundra for Wyler Racing in the 2010 NASCAR Camping World Truck Series.  In 2011 he returned to F1 with the HRT team, continued with the team in 2012 and was expected to drive for them in the 2013 season as well.  However, HRT was not included in the FIA's 2013 entry list, and thus Karthikeyan was left without a drive.  In 2013, Karthikeyan raced in the Auto GP series, securing 5 wins and 4 pole positions with Super Nova Racing.  For 2014, Karthikeyan has signed up with Team Impul, to race in the Japanese Super Formula series.

2016 6 Hours of Nürburgring: The 2016 6 Hours of Nürburgring (formally the WEC 6 Hours of Nürburgring) was an endurance sports car racing event held at the Nürburgring, Nürburg, Germany on 24 July 2016.  The Nürburgring round served as the fourth race of the 2016 FIA World Endurance Championship, and was the second running of the event as part of the championship.  58,000 people attended the race.

Supporting paragraphs: 2014 6 Hours of Spa-Francorchamps Sébastien Buemi
Answer: Scuderia Toro Rosso