unhappy at the prospect of the human race splitting in two 
(ROOT (ADJP (JJ unhappy) (PP (IN at) (NP (NP (DT the) (NN prospect)) (PP (IN of) (S (NP (DT the) (JJ human) (NN race)) (VP (VBG splitting) (PP (IN in) (NP (CD two))))))))))
(ROOT (ADJP (JJ ) (PP (IN ) (NP (NP (DT ) (NN )) (PP (IN ) (S (NP (DT ) (JJ ) (NN )) (VP (VBG ) (PP (IN ) (NP (CD ))))))))))