on a true and historically significant story 
(ROOT (PP (IN on) (NP (DT a) (ADJP (ADJP (JJ true)) (CC and) (ADJP (RB historically) (JJ significant))) (NN story))))
(ROOT (PP (IN ) (NP (DT ) (ADJP (ADJP (JJ )) (CC ) (ADJP (RB ) (JJ ))) (NN ))))