(S (S (S (NP (BASENP (NNS Hundreds)) (PP (IN of) (BASENP (NN riot) (NNS police)))) (VP (VBD were) (VP (VBN deployed)))) (CC but) (S (BASENP (PRP they)) (VP (VP (VBD did) (RB not)) (VP (VP (VB break) (PRT (RP up))) (BASENP (DT the) (NN demonstration)))))) (PERIOD .))