by the time the credits roll across the pat ending 
(ROOT (PP (IN by) (NP (NP (DT the) (NN time)) (SBAR (S (NP (DT the) (NNS credits)) (VP (VBP roll) (PP (IN across) (NP (DT the) (NN pat) (NN ending)))))))))
(ROOT (PP (IN ) (NP (NP (DT ) (NN )) (SBAR (S (NP (DT ) (NNS )) (VP (VBP ) (PP (IN ) (NP (DT ) (NN ) (NN )))))))))