Complex sentence: Spahn won more games (363) than any other left-handed pitcher, or any other pitcher who played his entire career in the post- 1920 live-ball era, and is acknowledged as one of the best pitchers in Major League Baseball history.
Split into simpler sentences: Spahn won more games (363) than any other left-handed pitcher in history, and more than any other pitcher who played his entire career in the post- 1920 live-ball era. He is acknowledged as one of the best pitchers in Major League Baseball history.