begins with promise , but runs aground after being snared in its own tangled plot 
(ROOT (S (VP (VBZ begins) (PP (IN with) (NP (NN promise)))) (, ,) (CC but) (VP (VBZ runs) (ADVP (RB aground)) (PP (IN after) (S (VP (VBG being) (VP (VBN snared) (PP (IN in) (NP (PRP$ its) (JJ own) (VBN tangled) (NN plot))))))))))
(ROOT (S (VP (VBZ ) (PP (IN ) (NP (NN )))) (, ) (CC ) (VP (VBZ ) (ADVP (RB )) (PP (IN ) (S (VP (VBG ) (VP (VBN ) (PP (IN ) (NP (PRP$ ) (JJ ) (VBN ) (NN ))))))))))