Complex sentence: Gus Johnson (December 13,1938--April 29,1987) was a professional basketball player who spent nine seasons with the National Basketball Association's Baltimore Bullets plus most of one basketball season with the Phoenix Suns and the Indiana Pacers of the ABA.
Split into simpler sentences: Gus Johnson (December 13,1938--April 29,1987) was a professional basketball player in the National Basketball Association (NBA). He spent nine seasons with the Baltimore Bullets, and a final season split between the Phoenix Suns and the Indiana Pacers of the ABA.