(S (S (ADVP (RB However)) (COMMA ,) (S (BASENP (NN fear)) (VP (VBZ has) (VP (VBN aroused) (SBAR (IN that) (S (NP (BASENP (NNP Zelaya) (POS 's)) (NN return)) (VP (MD could) (VP (VB trigger) (BASENP (JJR more) (NN violence)))))))))) (PERIOD .))