(S (S (SBAR (IN As) (S (BASENP (PRP he)) (VP (VBD prepared) (S (VP (TO to) (VP (VP (VB board) (BASENP (DT a) (NN plane))) (PP (IN out) (PP (IN of) (BASENP (NNP Canada)))))))))) (COMMA ,) (S (BASENP (NNP Canada) (NNP Border) (NNPS Services) (NNS agents)) (VP (VP (VP (VP (VBD took) (BASENP (DT the) (NN man))) (PP (IN into) (BASENP (NN custody)))) (PP (IN at) (NP (BASENP (NNP Pierre) (NNP Elliott) (NNP Trudeau) (NNP International) (NNP Airport)) (PP (IN in) (BASENP (NNP Montreal)))))) (PP (IN on) (BASENP (NNP Tuesday)))))) (PERIOD .))