Complex sentence: Before the season, Bancroft had departed as their manager, replaced by Mike Dorgan, who served as player-manager, and many of the players left as well, replaced with the likes of Hick Carpenter and Pete Hotaling.
Split into simpler sentences: Before the season began, Bancroft departed as their manager, and replaced by Mike Dorgan who served as player-manager. Many of the players left as well, who were replaced with the likes of Hick Carpenter and Pete Hotaling.