Complex sentence: All of these misadventures happened while Soheil Ayari was driving, while his teammate Sébastien Loeb proved to be able to drive as fast as his teammates for his first race on a closed track.
Split into simpler sentences: All of these misadventures happened while Soheil Ayari was driving. However, Loeb proved to be able to drive as fast as his team-mate for his first race on a closed track.