Complex sentence: He has had his fair share of injuries during his career, in 2001, he suffered a concussion which ended his season after just 12 games and he missed the entire 2005-06 season due to injury.
Split into simpler sentences: He has had his fair share of injuries during his career. In 2001, he suffered a concussion which ended his season after just 12 games and he missed the entire 2005-06 season due to injury.