Complex sentence: He is the founder and current CEO of Aftermath Entertainment and a former co-owner and artist of Death Row Records, also having produced albums for and overseeing the careers of many rappers signed to those record labels, such as Snoop Dogg, Eminem and 50 Cent.
Split into simpler sentences: He is the founder and current CEO of Aftermath Entertainment and a former co-owner and artist of Death Row Records. He has produced albums for and overseen the careers of many rappers, including Snoop Dogg, Eminem and 50 Cent.