(S (S (S (NP (BASENP (DT The) (NNP United) (NNPS States)) (CC and) (BASENP (NNP Russia))) (VP (BASENP (NN yesterday)) (VP (VBD agreed) (PP (TO to) (NP (BASENP (DT the) (NN swap)) (PP (IN of) (NP (BASENP (NNS prisoners)) (VP (VBN held) (PP (IN by) (BASENP (DT both) (NNS nations))))))))))) (SBAR (IN after) (S (BASENP (NN eleven) (JJ Russian) (NNS spies)) (VP (VBD were) (VP (VBN arrested) (BASENP (JJ late) (JJ last) (NN month))))))) (PERIOD .))