(S (S (PP (IN In) (BASENP (NN 1991) (CC and) (NN 1992))) (S (S (NP (BASENP (NN four)) (PP (IN of) (BASENP (NN six) (JJ Yugoslavian) (NNS republics)))) (VP (VBD declared) (BASENP (NN independence)))) (CC but) (S (NP (BASENP (NN two)) (PRN (COMMA ,) (BASENP (NNP Serbia) (CC and) (NNP Montenegro)) (COMMA ,))) (VP (VBD remained) (ADVP (RB together)))))) (PERIOD .))