Complex sentence: His identity remains unknown as he does not wish to seek fame and notoriety through music rather raise money for the causes he believes in to help those Americans who cannot afford medical treatments and the expensive medical insurance.
Split into simpler sentences: His identity remains unknown as he does not wish to seek fame and notoriety through music. He would rather raise money for the causes he believes in to help those Americans who cannot afford the proper medical treatment and the expensive medical insurance.