Complex sentence: He played for several teams and going into a controversial retirement in 1974, Allen returned to the Phillies in 1975 and 1976, and found Veteran's Stadium much to his liking, putting several home-run balls into the far parts of the upper deck.
Split into simpler sentences: He played for several teams and going into a controversial retirement in 1974, Allen returned to the Phillies in 1975 and 1976. Allen found Veteran's Stadium much to his liking, putting several home-run balls into the far parts of the upper deck.