only learning but inventing a remarkable new trick 
(ROOT (S (ADVP (RB only)) (VP (VP (NN learning)) (CC but) (VP (VBG inventing) (NP (DT a) (JJ remarkable) (JJ new) (NN trick))))))
(ROOT (S (ADVP (RB )) (VP (VP (NN )) (CC ) (VP (VBG ) (NP (DT ) (JJ ) (JJ ) (NN ))))))