Complex sentence: The lead single, "Party in the U.S.A.", became Cyrus'best-selling effort to date, peaking at number two in the "Billboard" Hot 100, and Hollywood Records' best-and fastest-selling single.
Split into simpler sentences: The lead single, "Party in the U.S.A.", became Cyrus'best-selling effort to date, peaking at number two in the "Billboard" Hot 100. It also became one of the best-selling singles in the United States and Hollywood Records' best-and fastest-selling single.