Complex sentence: He was the father of Olivia de Havilland and Joan Fontaine, both of whom were born in Tokyo while he resided there, to his first wife, Lilian Augusta; in 1919 she took them both to live in California.
Split into simpler sentences: He was the father of Olivia de Havilland and Joan Fontaine, both of whom were born in Tokyo while he resided there, to his first wife, Lilian Augusta. In 1919 she took them both to live in California.