Complex sentence: After Antonio Pettigrew later admitted to taking banned substances, the winning US team was disqualified; the victory of the US team initially gave Michael Johnson his ninth gold medal in the history of the World Championships, which was a new record.
Split into simpler sentences: After Antonio Pettigrew later admitted to taking banned substances, the winning US team was disqualified. The victory of the US team initially gave Michael Johnson his ninth gold medal in the history of the World Championships, a new record.