(S (S (S (BASENP (JJ Other) (JJ regional) (NNS sweeps)) (VP (VBP have) (VP (VBN been) (VP (VBN conducted) (ADVP (RB before)))))) (CONJP (COLON ;) (CC but)) (S (BASENP (DT this)) (VP (VP (VBD was) (NP (BASENP (DT the) (NN first)) (PP (IN of) (NP (BASENP (PRPD its) (NN kind)) (PP (IN at) (BASENP (DT the) (JJ national) (NN level))))))) (CC and) (VP (VBD resulted) (PP (IN in) (NP (NP (BASENP (DT the) (JJS highest) (NN number)) (PP (IN of) (BASENP (NNS arrests)))) (VP (ADVP (RB ever)) (VP (VBN recorded) (PP (IN in) (BASENP (DT a) (JJ single) (NN operation))))))))))) (PERIOD .))