Complex sentence: As a result, they qualified for the second wild card spot for the 2015 postseason and defeated the Pittsburgh Pirates in the 2015 National League Wild Card Game and the rival St. Louis Cardinals in the Division Series.
Split into simpler sentences: As a result, they qualified for the second wild card spot for the 2015 postseason and defeated the Pittsburgh Pirates in the 2015 National League Wild Card Game. They next defeated the rival St. Louis Cardinals in the Division Series.