Complex sentence: He was the middle child of the actors Maurice Barrymore and Georgie Drew Barrymore, and his two siblings were John and Ethel; these and other family members were part of an acting dynasty.
Split into simpler sentences: He was the middle child of the actors Maurice Barrymore and Georgie Drew Barrymore, and his two siblings were John and Ethel. These and other family members were part of an acting dynasty.