Complex sentence: Hassall married the actress Eve Lynett with whom he had a son and a daughter, the actress Imogen Hassall (god daughter of Novello), who appeared in several British films in the sixties and seventies.
Split into simpler sentences: Hassall married the actress Eve Lynett with whom he had a son and a daughter. His daughter was the actress Imogen Hassall (god daughter of Novello), who appeared in several British films in the sixties and seventies.