is never especially clever and often is rather pretentious 
(ROOT (S (VP (VBZ is) (ADVP (RB never)) (ADJP (RB especially) (JJ clever))) (CC and) (ADVP (RB often)) (VP (VBZ is) (ADJP (RB rather) (JJ pretentious)))))
(ROOT (S (VP (VBZ ) (ADVP (RB )) (ADJP (RB ) (JJ ))) (CC ) (ADVP (RB )) (VP (VBZ ) (ADJP (RB ) (JJ )))))