Complex sentence: In 1931 his daughter Joan, then sixteen years old, returned to Japan to live with him; in her autobiography, "No Bed of Roses", she claimed that her father made advances towards her during this period (which were rebuffed).
Split into simpler sentences: In 1931 his daughter Joan, then sixteen years old, returned to Japan to live with him. In her autobiography, "No Bed of Roses", she claimed that her father made advances towards her during this period (which were rebuffed).