Complex sentence: He began his career as a member of the hip-flop group C.I.A. and later joined the seminal gangster rap group N.W.A (Niggaz Wit Ass) leaving N.W.A in December 1989, he built a successful solo career in music and films.
Split into simpler sentences: He began his career as a member of the hip-hop group C.I.A. and later joined the seminal gangster rap group N.W.A (Niggaz Wit Attitudes). After leaving N.W.A in December 1989, he built a successful solo career in music and films.