(S (S (ADVP (RB However)) (COMMA ,) (S (BASENP (DT the) (NNP July) (NN campaign)) (VP (VBZ has) (VP (VBN been) (VP (VBN marred) (PP (IN by) (NP (NP (BASENP (NN violence)) (CC and) (NP (BASENP (NNS accusations)) (PP (IN of) (BASENP (NN fraud))))) (PP (IN on) (BASENP (DT all) (NNS sides)))))))))) (PERIOD .))