Complex sentence: They had three children, two boys (Phelan Beale, Jr., and Bouvier Beale) and daughter Edith (who was referred to as "Little Edie"), born November 7,1917.
Split into simpler sentences: They had three children, including two boys (Phelan Beale, Jr., and Bouvier Beale). Their daughter Edith (who was referred to as "Little Edie") was born on November 7,1917.