Complex sentence: Pabst continued to brew some of the Ballantine portfolio throughout the late 1980s and 1990s, they stopped brewing the IPA in 1996, and gradually all of the beers were discontinued with the exception of the flagship Ballantine XXX Ale.
Split into simpler sentences: Pabst continued to brew some of the Ballantine portfolio throughout the late 1980s and 1990s. They stopped brewing the IPA in 1996, and gradually all of the beers were discontinued with the exception of the flagship Ballantine XXX Ale.