part of being a good documentarian 
(ROOT (NP (NP (NN part)) (PP (IN of) (S (VP (VBG being) (NP (DT a) (JJ good) (NN documentarian)))))))
(ROOT (NP (NP (NN )) (PP (IN ) (S (VP (VBG ) (NP (DT ) (JJ ) (NN )))))))