Complex sentence: However, in 1967, despite playing only 59 games, he led the league with passed balls and is still on the top ten list for most passed balls in a season, though he spent a good deal of the season catching Knuckleballer Phil Niekro.
Split into simpler sentences: However, in 1967, despite playing only 59 games, he led the league with passed balls and is still on the top ten list for most passed balls in a season. At least a partial explanation is that he spent a good deal of the season catching Knuckleballer Phil Niekro.