Complex sentence: That season he led the league in hitting with a.355 batting average and.449 on base percentage, also leading the Cubs to the National League pennant and the last World Series appearance by the Cubs in the 20th century.
Split into simpler sentences: That season he led the league in hitting with a.355 average and.449 on base percentage. That same year Cavarretta led the Chicago Cubs to the National League Pennant and the last World Series appearance by the Cubs of the 20th century.