suffice to say its total promise is left slightly unfulfilled . 
(ROOT (S (VP (VB suffice) (S (VP (TO to) (VP (VB say) (SBAR (S (NP (PRP$ its) (JJ total) (NN promise)) (VP (VBZ is) (VP (VBN left) (S (ADJP (RB slightly) (JJ unfulfilled))))))))))) (. .)))
(ROOT (S (VP (VB ) (S (VP (TO ) (VP (VB ) (SBAR (S (NP (PRP$ ) (JJ ) (NN )) (VP (VBZ ) (VP (VBN ) (S (ADJP (RB ) (JJ ))))))))))) (. )))