are complex and quirky , but entirely believable 
(ROOT (VP (VBP are) (ADJP (ADJP (JJ complex) (CC and) (JJ quirky)) (, ,) (CC but) (ADJP (RB entirely) (JJ believable)))))
(ROOT (VP (VBP ) (ADJP (ADJP (JJ ) (CC ) (JJ )) (, ) (CC ) (ADJP (RB ) (JJ )))))