(S (S (S (BASENP (NNP Sri) (JJ Lankan) (NN government) (NNS troops)) (VP (VBP are) (VP (VBG claiming) (BASENP (PRPD their) (JJ first) (JJ significant) (NN victory))))) (SBAR (IN since) (S (BASENP (DT the) (NN peace) (NN accord)) (VP (VP (VP (VBD went) (PP (IN into) (BASENP (NN effect)))) (ADVP (BASENP (NN four) (NNS years)) (RB ago))) (COMMA ,) (S (VP (VBG capturing) (NP (NP (BASENP (DT the) (JJ rebel-held) (NN enclave)) (PP (IN of) (BASENP (NNP Sempur)))) (PP (IN in) (NP (BASENP (DT the) (NN country) (POS 's)) (BASENP (JJ embattled) (NN east))))))))))) (PERIOD .))