improbable as this premise may seem 
(ROOT (ADJP (ADJP (JJ improbable)) (SBAR (IN as) (S (NP (DT this) (NN premise)) (VP (MD may) (VP (VB seem)))))))
(ROOT (ADJP (ADJP (JJ )) (SBAR (IN ) (S (NP (DT ) (NN )) (VP (MD ) (VP (VB )))))))