partly a shallow rumination on the emptiness of success 
(ROOT (NP (ADVP (RB partly)) (NP (NP (DT a) (JJ shallow) (NN rumination)) (PP (IN on) (NP (NP (DT the) (NN emptiness)) (PP (IN of) (NP (NN success))))))))
(ROOT (NP (ADVP (RB )) (NP (NP (DT ) (JJ ) (NN )) (PP (IN ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (NN ))))))))