Complex sentence: On 18 December 2014, Renault announced his return to Motorsport in Brazil with four Fluences to two official teams, but after one win in three seasons Mitsubishi will not return in 2015.
Split into simpler sentences: On 18 December 2014, Renault announced their return to Brazilian motorsport with four Renault Fluences being run by two official teams. After one win in three seasons, Mitsubishi will not return in 2015.