Complex sentence: He married Elizabeth Woodford, widow of Lord Gerrard, by whom he had two sons and a daughter, Mary; the latter entered the service of Queen Henrietta Maria, and married the famous painter van Dyck, who painted several portraits of her.
Split into simpler sentences: He married Elizabeth Woodford, widow of Lord Gerrard, by whom he had two sons and a daughter, Mary. The latter entered the service of Queen Henrietta Maria and married the famous painter van Dyck, who painted several portraits of her.