sustain its initial promise with a jarring , new-agey tone creeping into the second half 
(ROOT (S (VP (VB sustain) (NP (PRP$ its) (JJ initial) (NN promise)) (PP (IN with) (S (NP (DT a) (JJ jarring) (, ,) (ADJP (JJ new) (HYPH -) (JJ agey)) (NN tone)) (VP (VBG creeping) (PP (IN into) (NP (DT the) (JJ second) (NN half)))))))))
(ROOT (S (VP (VB ) (NP (PRP$ ) (JJ ) (NN )) (PP (IN ) (S (NP (DT ) (JJ ) (, ) (ADJP (JJ ) (HYPH ) (JJ )) (NN )) (VP (VBG ) (PP (IN ) (NP (DT ) (JJ ) (NN )))))))))