(S (S (NP (BASENP (JJ Numerous) (NNS cities)) (PP (IN throughout) (NP (BASENP (NNP Texas)) (COMMA ,) (BASENP (NNP United) (NNPS States))))) (VP (VBP have) (VP (VBN begun) (S (VP (VBG broadening) (NP (BASENP (PRPD their) (NNS efforts)) (SBAR (S (VP (TO to) (VP (VP (VB fight) (BASENP (NN mosquito) (NNS populations))) (COMMA ,) (PP (IN in) (NP (BASENP (DT an) (NN effort)) (SBAR (S (VP (TO to) (VP (VB reduce) (NP (BASENP (NN transmission)) (PP (IN of) (BASENP (DT the) (JJ sometimes-lethal) (NNP West) (NNP Nile) (NN virus)))))))))))))))))))) (PERIOD .))