compelling , gut-clutching piece 
(ROOT (FRAG (ADJP (JJ compelling)) (, ,) (NP (ADJP (NN gut) (HYPH -) (VBG clutching)) (NN piece))))
(ROOT (FRAG (ADJP (JJ )) (, ) (NP (ADJP (NN ) (HYPH ) (VBG )) (NN ))))