Complex sentence: He left the game in week 7 against the Kansas City Chiefs due to a calf injury, and then in week 9 had to leave the game they lost to the Indianapolis Colts with a season ending back injury.
Split into simpler sentences: He left the game in Week 7 against the Kansas City Chiefs due to a calf injury. In Week 9, he had to leave the game they lost to the Indianapolis Colts with a season ending back injury.