(S (S (PP (IN On) (BASENP (NNP August) (NN 7))) (COMMA ,) (S (BASENP (JJ Georgian) (NNS troops)) (VP (VBD launched) (NP (BASENP (DT an) (JJ offensive)) (PP (IN against) (NP (BASENP (DT the) (JJ Ossetian) (NN town)) (PP (IN of) (BASENP (NNP Tskhinvali))))))))) (PERIOD .))