is at once luridly graphic and laughably unconvincing 
(ROOT (VP (VBZ is) (PP (IN at) (RB once)) (ADJP (ADJP (RB luridly) (JJ graphic)) (CC and) (ADJP (RB laughably) (JJ unconvincing)))))
(ROOT (VP (VBZ ) (PP (IN ) (RB )) (ADJP (ADJP (RB ) (JJ )) (CC ) (ADJP (RB ) (JJ )))))