heavyweights joel silver and robert zemeckis agreed to produce this 
(ROOT (S (NP (NNS heavyweights)) (VP (VBP joel) (NP (NP (NN silver)) (CC and) (NP (NNP robert) (NNP zemeckis)))) (VP (VBD agreed) (S (VP (TO to) (VP (VB produce) (NP (DT this))))))))
(ROOT (S (NP (NNS )) (VP (VBP ) (NP (NP (NN )) (CC ) (NP (NNP ) (NNP )))) (VP (VBD ) (S (VP (TO ) (VP (VB ) (NP (DT ))))))))