sacrificing the integrity of the opera 
(ROOT (S (VP (VBG sacrificing) (NP (NP (DT the) (NN integrity)) (PP (IN of) (NP (DT the) (NN opera)))))))
(ROOT (S (VP (VBG ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (DT ) (NN )))))))