(S (S (BASENP (DT The) (NN dispute)) (VP (VBZ dates) (ADVP (RB back) (PP (TO to) (NP (BASENP (NNP June)) (SBAR (WHADVP (WRB when)) (S (BASENP (NN violence)) (VP (VBD erupted) (PP (IN between) (NP (BASENP (DT the) (NNS nations)) (PP (IN in) (NP (BASENP (DT the) (NN border) (NN region)) (PP (IN of) (BASENP (NNP Doumeira))))))))))))))) (PERIOD .))