(S (S (ADVP (RB Historically)) (COMMA ,) (S (BASENP (EX there)) (VP (VBP have) (VP (VBN been) (NP (BASENP (DT some) (NNS objections)) (VP (VBN raised) (PP (IN over) (NP (BASENP (JJ aerial) (NN spraying)) (CC and) (NP (BASENP (DT the) (JJ potential) (NN health) (NNS hazards)) (SBAR (S (S (VP (VBG distributing) (BASENP (JJ such) (NNS chemicals)))) (VP (MD may) (VP (VB pose)))))))))))))) (PERIOD .))