good actors , good poetry and good music help sustain it 
(ROOT (S (NP (NP (JJ good) (NNS actors)) (, ,) (NP (JJ good) (NN poetry)) (CC and) (NP (JJ good) (NN music))) (VP (VBP help) (S (VP (VB sustain) (NP (PRP it)))))))
(ROOT (S (NP (NP (JJ ) (NNS )) (, ) (NP (JJ ) (NN )) (CC ) (NP (JJ ) (NN ))) (VP (VBP ) (S (VP (VB ) (NP (PRP )))))))