(S (S (ADVP (RB Afterwards)) (COMMA ,) (S (BASENP (DT the) (JJ other) (NNS militants)) (VP (VP (VBD engaged) (PP (IN in) (NP (BASENP (DT a) (JJ massive) (NN gun) (NN attack)) (PP (IN on) (BASENP (DT the) (NN prison) (NNS guards)))))) (COMMA ,) (S (VP (VBG allowing) (S (BASENP (NNS prisoners)) (VP (TO to) (VP (VB escape))))))))) (PERIOD .))