Complex sentence: Busch won six additional races with Penske's No.2 team, his last being the 2010 Coca-Cola 600, and qualified for the Chase three times, with a best placing of 4th in the final standings.
Split into simpler sentences: Busch won six additional races with with the No.2 car, his last being the 2010 Coca-Cola 600. He qualified for the Chase three times, with a best finish of fourth in the final standings.