Complex sentence: In five subsequent starts, he was unable to match his success from that game; after a brief demotion to Columbus in August, Rivera made one last start in the major leagues in September before he was moved to the Yankees' bullpen.
Split into simpler sentences: In five subsequent starts, he was unable to match his success from that game. After a brief demotion to Columbus in August, Rivera made one last start in the major leagues in September before he was moved to the Yankees' bullpen.