feels the dimming of a certain ambition 
(ROOT (VP (VBZ feels) (NP (NP (DT the) (NN dimming)) (PP (IN of) (NP (DT a) (JJ certain) (NN ambition))))))
(ROOT (VP (VBZ ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (DT ) (JJ ) (NN ))))))