That is where I happened to open this book, where I closed it, and why this review is so brief.
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(ROOT (S (NP (DT That)) (VP (VBZ is) (SBAR (SBAR (WHADVP (WRB where)) (S (NP (PRP I)) (VP (VBD happened) (S (VP (TO to) (VP (VB open) (NP (DT this) (NN book)))))))) (, ,) (SBAR (WHADVP (WRB where)) (S (NP (PRP I)) (VP (VBD closed) (NP (PRP it))))) (, ,) (CC and) (SBAR (WHADVP (WRB why)) (S (NP (DT this) (NN review)) (VP (VBZ is) (ADJP (RB so) (JJ brief))))))) (. .)))
This review is so short because of where I opened and closed the book.
( ( This review ) ( ( ( is ( so short ) ) ( because ( of ( where ( I ( ( opened and ) ( closed ( the book ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT This) (NN review)) (VP (VBZ is) (ADJP (RB so) (JJ short)) (PP (RB because) (IN of) (SBAR (WHADVP (WRB where)) (S (NP (PRP I)) (VP (VP (VBD opened)) (CC and) (VP (VBD closed) (NP (DT the) (NN book)))))))) (. .)))