Complex sentence: Negash' national breakthrough breakthrough came when he was 16 and joined the successful group Majors, which consisted of Negash and DMC winner Dj Noize.
Split into simpler sentences: Negash' national breakthrough came when he was 16 and joined the successful group Majors. The breakthrough came when he was 16 and joined the successful group Majors, which also consisted of DMC winner Dj Noize.