maintaining the appearance of clinical objectivity 
(ROOT (S (VP (VBG maintaining) (NP (NP (DT the) (NN appearance)) (PP (IN of) (NP (JJ clinical) (NN objectivity)))))))
(ROOT (S (VP (VBG ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (JJ ) (NN )))))))