fear and frustration are provoked to intolerable levels 
(ROOT (S (NP (NN fear) (CC and) (NN frustration)) (VP (VBP are) (VP (VBN provoked) (PP (IN to) (NP (JJ intolerable) (NNS levels)))))))
(ROOT (S (NP (NN ) (CC ) (NN )) (VP (VBP ) (VP (VBN ) (PP (IN ) (NP (JJ ) (NNS )))))))