Complex sentence: He set several passing records during his time in the NFL and is credited for inventing the alley-oop but was notable for never winning a league championship despite three consecutive appearances in the game for the Giants, who retired his number 14.
Split into simpler sentences: He set several passing records during his time in the NFL and is credited for inventing the alley-oop. He was never able to win a league championship despite three consecutive appearances in the game for the Giants, who retired his number 14.