(S (S (NP (NNS Efforts) (SBAR (S (VP (TO to) (VP (VB implement) (NP (BASENP (DT a) (NN warning) (NN system)) (ADJP (JJ similar) (PP (TO to) (NP (BASENP (DT that)) (VP (VBN coordinated) (PP (IN by) (NP (BASENP (DT the) (NNP Pacific) (NNP Tsunami) (NNP Warning) (NNP Center)) (PP (IN in) (BASENP (NNP Hawaii))))))))))))))) (VP (VBP have) (NP (JJ past) (NP (BASENP (DT a) (NN number)) (PP (IN of) (BASENP (JJ significant) (NNS milestones))))))) (PERIOD .))