begins to drag two-thirds through , when the melodramatic aspects start to overtake the comedy 
(ROOT (S (VP (VBZ begins) (S (VP (TO to) (VP (VB drag) (ADVP (ADVP (NP (CD two) (HYPH -) (NNS thirds)) (RB through)) (, ,) (SBAR (WHADVP (WRB when)) (S (NP (DT the) (JJ melodramatic) (NNS aspects)) (VP (VBP start) (S (VP (TO to) (VP (VB overtake) (NP (DT the) (NN comedy)))))))))))))))
(ROOT (S (VP (VBZ ) (S (VP (TO ) (VP (VB ) (ADVP (ADVP (NP (CD ) (HYPH ) (NNS )) (RB )) (, ) (SBAR (WHADVP (WRB )) (S (NP (DT ) (JJ ) (NNS )) (VP (VBP ) (S (VP (TO ) (VP (VB ) (NP (DT ) (NN )))))))))))))))