Complex sentence: In "Psycho III", it was revealed she only delusionally believed she was Norman's mother, and furthermore Spool had been in a love triangle with Norman's father and mother and that she had killed Norman's father.
Split into simpler sentences: In "Psycho III", it was revealed she only delusionally believed she was Norman's mother. Furthermore, in "III" it is revealed Spool had been in a love triangle with Norman's father and mother and that she had killed Norman's father.