(S (S (S (BASENP (JJR Richer) (NNS countries)) (VP (VBP are) (VP (VBG being) (VP (VBN accused) (PP (IN of) (S (VP (VP (VBG demanding) (BASENP (ADJP (RB too) (JJ many)) (NNS concessions))) (PP (IN in) (NP (BASENP (NN return)) (PP (IN for) (S (VP (VP (VP (VBG opening) (PRT (RP up))) (BASENP (NN trade))) (CC and) (VP (VBG reducing) (BASENP (NNS subsidies))))))))))))))) (SBAR (IN while) (S (BASENP (PRP they)) (VP (VBP say) (SBAR (IN that) (S (BASENP (DT the) (JJR poorer) (NNS countries)) (VP (VBP are) (VP (VP (VP (VBG holding) (BASENP (PRP them))) (PP (TO to) (BASENP (NN ransom)))) (PP (IN by) (S (VP (VBG blocking) (BASENP (NN progress))))))))))))) (PERIOD .))