Complex sentence: A year later, he was asked to join rap group, Whodini as a breakdancer, then months later, he and his group U.T.F.O., became the number one Rap and Breakdance act in the country.
Split into simpler sentences: A year later, he was asked to join rap group Whodini as a breakdancer. Then months later, he and his group, U.T.F.O., became the number one Rap and Breakdance act in the country.