(S (S (BASENP (DT The) (NNS protesters)) (VP (VBP have) (VP (VP (VP (VBN linked) (BASENP (PRPD their) (NNS arms))) (PP (IN in) (BASENP (DT a) (NN chain)))) (S (VP (TO to) (VP (VB attempt) (S (VP (TO to) (VP (VB prevent) (S (BASENP (PRP themselves)) (VP (VBG being) (VP (VBN removed))))))))))))) (PERIOD .))