undercut by the voice of the star of road trip 
(ROOT (S (VP (VBN undercut) (PP (IN by) (NP (NP (DT the) (NN voice)) (PP (IN of) (NP (NP (DT the) (NN star)) (PP (IN of) (NP (NN road) (NN trip))))))))))
(ROOT (S (VP (VBN ) (PP (IN ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (NN ) (NN ))))))))))