well acted by the four primary actors 
(ROOT (SINV (ADVP (RB well)) (VP (VBN acted) (PP (IN by) (NP (DT the) (CD four) (JJ primary) (NNS actors))))))
(ROOT (SINV (ADVP (RB )) (VP (VBN ) (PP (IN ) (NP (DT ) (CD ) (JJ ) (NNS ))))))