Complex sentence: Chesbro's 1904 pitching totals of 51 games started and 48 complete games also fall into the same historical category as his 1904 wins total, as they are all-time American League single-season records.
Split into simpler sentences: Chesbro's 1904 pitching totals of 51 games started and 48 complete games also fall into the same historical category as his 1904 wins total. The totals are all all-time American League single-season records.