Complex sentence: In 1933 he recorded career-numbers in wins (12), starts (21), and innings pitched (164 ⅔), even though his career ended prematurily at the age of 28 because of a chronic sore arm.
Split into simpler sentences: In 1933 he recorded career-numbers in wins (12), starts (21), and innings pitched (164 ⅔). His career ended prematurily at the age of 28 because of a chronic sore arm.