Complex sentence: Robin Williams' first marriage was to Valerie Velardi on June 4,1978, with whom he has one child, Zachary Pym (Zak) (born April 11,1983).
Split into simpler sentences: Robin Williams' first marriage was to Valerie Velardi on June 4,1978. They have one child, Zachary Pym (Zak) (born April 11,1983).