a derivative collection of horror and sci-fi 
(ROOT (NP (NP (DT a) (JJ derivative) (NN collection)) (PP (IN of) (NP (NN horror) (CC and) (NN sci-fi)))))
(ROOT (NP (NP (DT ) (JJ ) (NN )) (PP (IN ) (NP (NN ) (CC ) (NN )))))