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)) (. .)))
It is only a piece of a story without a real ending. 
( It ( ( ( ( is only ) ( ( a piece ) ( of ( a story ) ) ) ) ( without ( a ( real ending ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ is) (ADVP (RB only)) (NP (NP (DT a) (NN piece)) (PP (IN of) (NP (DT a) (NN story)))) (PP (IN without) (NP (DT a) (JJ real) (NN ending)))) (. .)))