Complex sentence: The team improved upon their previous season's 7--9 disappointment, winning ten games and returning to the playoffs for the second time in three years, ending the season the season on a four-game winning streak.
Split into simpler sentences: The team improved upon their previous season's 7--9 disappointment, winning ten games and returning to the playoffs for the second time in three years. They ended the season on a four-game winning streak.