enriched by a strong and unforced supporting cast 
(ROOT (S (VP (VBN enriched) (PP (IN by) (NP (DT a) (ADJP (JJ strong) (CC and) (JJ unforced)) (VBG supporting) (NN cast))))))
(ROOT (S (VP (VBN ) (PP (IN ) (NP (DT ) (ADJP (JJ ) (CC ) (JJ )) (VBG ) (NN ))))))