initially gripping , eventually cloying pow drama . 
(ROOT (S (ADVP (RB initially)) (VP (VBG gripping) (, ,) (ADVP (RB eventually)) (VP (VBG cloying)) (NN pow) (NN drama)) (. .)))
(ROOT (S (ADVP (RB )) (VP (VBG ) (, ) (ADVP (RB )) (VP (VBG )) (NN ) (NN )) (. )))