Complex sentence: The Bees were locked in a late season pennant race with the Vernon Tigers, which the Tigers won after they defeated the Bees in nine out of 11 games played late in the season, which included three poor performances from Dale.
Split into simpler sentences: The Bees were locked in a late season pennant race with the Vernon Tigers that season. The Tigers won the pennant after they defeated the Bees in nine out of 11 games played late in the season, which included three poor performances from Dale.