(S (S (BASENP (DT The) (NNP US)) (VP (VP (VBD arrested) (NP (BASENP (DT the) (NN ten) (NNS spies)) (SBAR (WHNP (WDT that)) (S (VP (VBP are) (S (VP (TO to) (VP (VB be) (VP (VBN returned) (PP (TO to) (BASENP (NNP Russia)))))))))))) (PP (IN as) (NP (BASENP (NN part)) (PP (IN of) (NP (BASENP (PRPD its) (NN breakup)) (PP (IN of) (NP (BASENP (DT a) (JJ long-term) (NN spy) (NN ring)) (SBAR (WHNP (WDT that)) (S (VP (VBD had) (VP (VP (VBN operated) (PP (IN for) (BASENP (NNS years)))) (CONJP (COMMA ,) (CC and)) (VP (VP (VBN involved) (BASENP (DT the) (NNS spies))) (S (VP (VBG living) (PP (PP (IN as) (BASENP (JJ American) (NNS civilians))) (COMMA ,) (PP (BASENP (DT some)) (PP (IN as) (BASENP (NNS couples)))))))))))))))))))) (PERIOD .))