is credible and remarkably mature . 
(ROOT (S (VP (VBZ is) (ADJP (ADJP (JJ credible)) (CC and) (ADJP (RB remarkably) (JJ mature)))) (. .)))
(ROOT (S (VP (VBZ ) (ADJP (ADJP (JJ )) (CC ) (ADJP (RB ) (JJ )))) (. )))