Complex sentence: Atwill married the American actress Elsie Mackay in 1920, and Louise Cromwell Brooks (former wife of Douglas MacArthur) in 1930; they divorced in 1943.
Split into simpler sentences: Atwill married the American actress Elsie Mackay in 1920. He married Louise Cromwell Brooks in 1930, after her divorce from Douglas MacArthur; they divorced in 1943.