the audience was put through torture for an hour and a half 
(ROOT (S (NP (DT the) (NN audience)) (VP (VBD was) (VP (VBN put) (PP (IN through) (NP (NN torture))) (PP (IN for) (NP (DT an) (NN hour) (QP (CC and) (DT a) (NN half))))))))
(ROOT (S (NP (DT ) (NN )) (VP (VBD ) (VP (VBN ) (PP (IN ) (NP (NN ))) (PP (IN ) (NP (DT ) (NN ) (QP (CC ) (DT ) (NN ))))))))