Complex sentence: They divorced in 1972 after she became involved with Steve McQueen on the set of "The Getaway", whom she then married on August 31,1973, and divorced in 1978.
Split into simpler sentences: They divorced in 1972 after she became involved with Steve McQueen on the set of "The Getaway". She married McQueen on August 31,1973, and divorced him in 1978.