(S (S (NP (BASENP (DT The) (JJ first) (JJ large-scale) (NN trial)) (PP (IN of) (NP (BASENP (DT a) (NN vaccine)) (PP (IN for) (BASENP (NN HIV)))))) (VP (VBZ has) (VP (VBN been) (VP (VBN launched) (PP (IN in) (BASENP (NNP South) (NNP Africa))))))) (PERIOD .))