Complex sentence: The pair suffered a further retirement from the Goodwood Nine Hours when, during the race, the car being driven by Thompson entered the pitlane with smoke coming out of the car and Parnell was not prepared to take over the seat.
Split into simpler sentences: The pair suffered a further retirement from the Goodwood Nine Hours. During the race the car being driven by Thompson entered the pitlane with smoke coming out of the car with Parnell unprepared to take over the seat.