Complex sentence: Thalia Fortescue Massie was the daughter of Grace Hubbard Fortescue and the wife of a Navy lieutenant, who claimed that in September, 1931, that a group of Hawaiian men had raped her at Ala Moana Beach in Honolulu.
Split into simpler sentences: Thalia Fortescue Massie was the daughter of Grace Hubbard Fortescue and the wife of a Navy lieutenant. She claimed that in September, 1931, a group of Hawaiian men had raped her at Ala Moana Beach in Honolulu.