(S (S (S (BASENP (NNS Efforts) (JJ last) (NN year)) (VP (VBD failed) (S (VP (TO to) (VP (VB halt) (BASENP (DT the) (NN disease))))))) (SBAR (IN because) (S (BASENP (ADJP (RB not) (JJ enough)) (NNS children)) (VP (VBD were) (VP (VBN vaccinated)))))) (PERIOD .))