(S (S (NP (NP (BASENP (DT The) (NNS leaders)) (PP (IN of) (NP (QP (ADVP (RBR more) (IN than)) (NN 50)) (NNS countries)))) (CC and) (NP (BASENP (NNS heads)) (PP (IN of) (BASENP (JJ several) (JJ international) (NNS organizations))))) (VP (VBD attended) (BASENP (DT the) (NN parade)))) (PERIOD .))