while the extensive use of stock footage quickly becomes a tiresome cliché 
(ROOT (SBAR (IN while) (S (NP (NP (DT the) (JJ extensive) (NN use)) (PP (IN of) (NP (NN stock) (NN footage)))) (ADVP (RB quickly)) (VP (VBZ becomes) (NP (DT a) (JJ tiresome) (NN cliché))))))
(ROOT (SBAR (IN ) (S (NP (NP (DT ) (JJ ) (NN )) (PP (IN ) (NP (NN ) (NN )))) (ADVP (RB )) (VP (VBZ ) (NP (DT ) (JJ ) (NN ))))))