(S (S (PP (IN During) (BASENP (DT the) (NN trip))) (COMMA ,) (S (NP (BASENP (DT a) (NN group)) (PP (IN of) (BASENP (NNS youths)))) (VP (VBD started) (S (VP (VP (VBG breaking) (BASENP (NN everything))) (PP (IN for) (BASENP (DT no) (JJ apparent) (NN reason)))))))) (PERIOD .))