Complex sentence: His 1956 season was the best of Larsen's career; adopting a no-windup delivery late in the season, he posted an 11--5 record, with a career best 107 strikeouts and a 3.26 ERA.
Split into simpler sentences: His 1956 season was the best of Larsen's career. He posted an 11--5 record, with a career best 107 strikeouts and a 3.26 ERA.