(S (S (BASENP (NNP Oprah) (NNP Winfrey)) (VP (VBZ has) (VP (VBN announced) (SBAR (IN that) (S (BASENP (PRP she)) (VP (MD will) (VP (VP (VP (VB retire) (PP (IN from) (BASENP (PRPD her) (NN talk) (NN show)))) (PP (IN on) (NP (BASENP (NNP September) (NN 9)) (COMMA ,) (BASENP (NN 2011))))) (COMMA ,) (PP (IN during) (BASENP (NN season) (NN 25)))))))))) (PERIOD .))