who starts off promisingly but then proceeds to flop 
(ROOT (SBAR (WHNP (WP who)) (S (VP (VP (VBZ starts) (PRT (RP off)) (ADVP (RB promisingly))) (CC but) (ADVP (RB then)) (VP (VBZ proceeds) (S (VP (TO to) (VP (VB flop)))))))))
(ROOT (SBAR (WHNP (WP )) (S (VP (VP (VBZ ) (PRT (RP )) (ADVP (RB ))) (CC ) (ADVP (RB )) (VP (VBZ ) (S (VP (TO ) (VP (VB )))))))))