Complex sentence: Lazzeri holds the American League record for most RBI in a game with 11, set May 24 1936, as he also became the first major league player to hit two grand slams in one game.
Split into simpler sentences: Lazzeri holds the American League record for most RBI in a game with 11, set May 24 1936. That same day he became the first major league player to hit two grand slams in one game.