heavyweights joel silver and robert zemeckis 
(ROOT (S (NP (NNS heavyweights)) (VP (VBP joel) (NP (NP (NN silver)) (CC and) (NP (NNP robert) (NNP zemeckis))))))
(ROOT (S (NP (NNS )) (VP (VBP ) (NP (NP (NN )) (CC ) (NP (NNP ) (NNP ))))))