(S (S (S (NP (BASENP (DT The) (NN group)) (PRN (COMMA ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (VP (VP (VBN listed) (PP (IN as) (BASENP (DT a) (NN terrorist) (NN organization)))) (PP (IN by) (NP (BASENP (DT the) (NNP European) (NNP Union)) (CC and) (BASENP (DT the) (NNP United) (NNPS States)))))))) (COMMA ,))) (VP (VBP have) (VP (VP (VP (VBN declared) (BASENP (NNS ceasefires))) (BASENP (JJ several) (NNS times))) (ADVP (RB before))))) (COMMA ,) (SBAR (WHNP (WDT which)) (S (VP (VBP have) (VP (BASENP (DT all)) (VP (VBN ended) (PP (IN in) (NP (BASENP (DT a) (NN resumption)) (PP (IN of) (BASENP (NN violence))))))))))) (PERIOD .))