Which is really a story from beginning to end, I suppose.
( ( Which ( ( is really ) ( ( a story ) ( from ( beginning ( to end ) ) ) ) ) ) ( , ( I ( suppose . ) ) ) )
(ROOT (S (SBAR (WHNP (WDT Which)) (S (VP (VBZ is) (ADVP (RB really)) (NP (NP (DT a) (NN story)) (PP (IN from) (S (VP (VBG beginning) (S (VP (TO to) (VP (VB end))))))))))) (, ,) (NP (PRP I)) (VP (VBP suppose)) (. .)))
The ending of the story is most significant, I think. 
( ( ( ( The ending ) ( of ( the story ) ) ) ( is ( most significant ) ) ) ( , ( I ( think . ) ) ) )
(ROOT (S (S (NP (NP (DT The) (NN ending)) (PP (IN of) (NP (DT the) (NN story)))) (VP (VBZ is) (ADJP (RBS most) (JJ significant)))) (, ,) (NP (PRP I)) (VP (VBP think)) (. .)))