(S (S (BASENP (DT The) (JJ present) (NN system)) (VP (VBZ consists) (PP (IN of) (NP (BASENP (NNP Trident) (JJ ballistic) (NNS missiles)) (PP (IN with) (NP (BASENP (JJ nuclear) (NNS warheads)) (VP (VBN carried) (PP (IN by) (BASENP (NN four) (NNP Vanguard) (NN class) (ADJP (NN nuclear) (VBN powered)) (NNS submarines)))))))))) (PERIOD .))