by his lack of self-awareness 
(ROOT (PP (IN by) (NP (NP (PRP$ his) (NN lack)) (PP (IN of) (NP (NN self) (HYPH -) (NN awareness))))))
(ROOT (PP (IN ) (NP (NP (PRP$ ) (NN )) (PP (IN ) (NP (NN ) (HYPH ) (NN ))))))