Complex sentence: Robert L. Johnson (born April 8,1946) is an American business magnate best known for being the founder of television network Black Entertainment Television (BET), and is also its former chairman and chief executive officer.
Split into simpler sentences: Robert L. Johnson (born April 8,1946) is an American media magnate. He is best known for being the founder of television network Black Entertainment Television (BET), and is also its former chairman and chief executive officer.