an interesting and at times captivating 
(ROOT (NP (DT an) (ADJP (ADJP (JJ interesting)) (CC and) (ADJP (PP (IN at) (NP (NNS times))) (JJ captivating)))))
(ROOT (NP (DT ) (ADJP (ADJP (JJ )) (CC ) (ADJP (PP (IN ) (NP (NNS ))) (JJ )))))