Complex sentence: He is interrupted by the arrival of Angela--who secretly planned this encounter out of hate for her parents' lack of affection--along with her mute governess, Traunitz, and a small army of grotesque dolls.
Split into simpler sentences: He is interrupted by the arrival of Angela, who secretly planned this encounter out of hate for her parents' lack of affection. She shows up with her mute governess, Traunitz, and a small army of grotesque dolls.