Complex sentence: The record for the most innings ever played in a single professional game is 33, occurring in a 1981 minor-league game between the Pawtucket Red Sox and the Rochester Red Wings, AAA affiliates of the Boston Red Sox and the Baltimore Orioles, respectively.
Split into simpler sentences: The record for the most innings ever played in a single professional game is 33, occurring in a minor-league game in 1981. The game was between the Pawtucket Red Sox and the Rochester Red Wings, AAA affiliates of the Boston Red Sox and the Baltimore Orioles, respectively.