Complex sentence: Rawleigh Warner, Jr. (February 13,1921June 26,2013) was an American business executive, who was president of Mobil from 1965 to 1969 and chairman and chief executive officer from 1969 to 1986.
Split into simpler sentences: Rawleigh Warner, Jr. (February 13,1921June 26,2013) was an American businessman. He was president of Mobil from 1965 to 1969 and chairman and chief executive officer from 1969 to 1986.