Complex sentence: At Sullavan's insistence, she and Hayward divorced in 1947, and three years later she married Kenneth Wagg, an English investment banker, to whom she was married at the time of her death.
Split into simpler sentences: At Sullavan's insistence, she and Hayward divorced in 1947. Three years after divorcing Hayward, she married Kenneth Wagg, an English investment banker, to whom she was married at the time of her death.