Sentence:  It is against this background, where a need for simplicity can already be detected, that Kraepelin brought about his supreme effort of synthesis by reducing the multifarious field of simple and composite psychoses to what can be called 'the two <WSD>supercomposite</WSD> insanities', dementia praecox and manic-depressive insanity. 
Meaning of the word marked with <WSD> tags:  An amalgam of composites; a combination of elements that are themselves combinations.