Complex sentence: His first marriage, to Joslyn "Lyn" Carter, with whom LeBlanc had two children, lasted from 1966 to 1981; in 1994, he married Diana Fowler, who also had two children from a previous marriage.
Split into simpler sentences: His first marriage, to Joslyn "Lyn" Carter, with whom LeBlanc had two children, lasted from 1966 to 1981. In 1994 he married Diana Fowler, who also had two children from a previous marriage.