(S (S (NP (NP (BASENP (RB Nearly) (NN half)) (PP (IN of) (BASENP (DT all) (NNS families)))) (PP (IN in) (NP (BASENP (NNP Djibouti) (POS 's)) (NN northwest)))) (VP (VBD were) (VP (VBN forced) (S (VP (TO to) (VP (VB migrate) (S (VP (TO to) (VP (VB find) (NP (BASENP (NN pasture)) (PP (IN for) (BASENP (PRPD their) (NN livestock))))))))))))) (PERIOD .))