Complex sentence: He was called up on July 11,2010 to replace Jake Peavy as the 5th starter, who is out for the season with a strained right latissimus dorsi muscle.
Split into simpler sentences: He was called up on July 11,2010 to replace Jake Peavy as the 5th starter. Peavy is out for the season with a strained right latissimus dorsi muscle.