Complex sentence: After brake and gearbox troubles in the race the pair finished 109 laps, 100 laps behind the winning Porsche 956, although, despite still running at the end, the car had not completed enough laps to be classified as a finisher.
Split into simpler sentences: After brake and gearbox troubles in the race the pair finished 109 laps, 100 laps behind the winning Porsche 956. Unfortunately, despite still running at the end, the car had not completed enough laps to be classified as a finisher.