Complex sentence: Howard Robard Hughes, Sr. (September 9,1869--January 14,1924) was an American entrepreneur, best known as the father of Howard Robard Hughes, Jr., the famous aviation pioneer and film producer.
Split into simpler sentences: Howard Robard Hughes, Sr. (September 9,1869--January 14,1924) was an American businessman. HE is best known as the father of Howard Robard Hughes, Jr., the famous aviation pioneer and film producer.