Complex sentence: On August 30,1905, in his first major league at-bat, he doubled off the New York Highlanders' Jack Chesbro, who had won a record 41 games the previous season.
Split into simpler sentences: On August 30,1905, in his first major league at bat, he doubled off of Jack Chesbro of the New York Highlanders. Chesbro had won a record 41 games the previous season.