Complex sentence: So the new diagnosis requires two episodes of psychosis instead of one, and "requires the overlap of mood (disorder) symptoms with psychotic symptoms to be conspicuous" and last for a greater portion of the disorder.
Split into simpler sentences: So the new diagnosis requires two episodes of psychosis instead of one. The other period of psychosis "requires the overlap of mood (disorder) symptoms with psychotic symptoms to be conspicuous" and last for a greater portion of the disorder.