(S (S (PP (IN Since) (BASENP (DT the) (JJ last) (NNPS Olympics))) (COMMA ,) (S (BASENP (NNP Japan)) (VP (VBZ has) (VP (VBN been) (PP (IN in) (BASENP (DT a) (NN rebuilding) (NN period))))))) (PERIOD .))