Complex sentence: Caleb Moore (January 1,1987-January 31,2013) was an American professional snowmobile racer and the first person to die as a result of injuries sustained during the X Games.
Split into simpler sentences: Caleb Moore (January 1,1987-January 31,2013) was an American professional snowmobile racer. He was the first person to die as a result of injuries sustained during the X Games.