some movies were made for the big screen , some for the small screen 
(ROOT (S (S (NP (DT some) (NNS movies)) (VP (VBD were) (VP (VBN made) (PP (IN for) (NP (DT the) (JJ big) (NN screen)))))) (, ,) (S (NP (DT some)) (PP (IN for) (NP (DT the) (JJ small) (NN screen))))))
(ROOT (S (S (NP (DT ) (NNS )) (VP (VBD ) (VP (VBN ) (PP (IN ) (NP (DT ) (JJ ) (NN )))))) (, ) (S (NP (DT )) (PP (IN ) (NP (DT ) (JJ ) (NN ))))))