Complex sentence: Thereafter, He took 3 more race victories during the course of the 2007 season, before coming up short in the fight for overall honours to Kimi Räikkönen by a just point in his debut season.
Split into simpler sentences: Thereafter, He took 3 more race victory during the course of the 2007 season. Unfortunately, he lost the drivers' championship to Kimi Räikkönen by a point in his debut season.