Complex sentence: The Leen Teens were managed by Norman Petty, who later renamed them the String-A-Longs, and in 1960 they had their biggest hit with "Wheels", which reached number 2.
Split into simpler sentences: The Leen Teens were managed by Norman Petty, who later renamed them the String-A-Longs. In 1960, the String-A-Longs had their biggest hit with "Wheels", which reached number 2.