The work in question offers nothing regarding language, so its review here is ancillary to the main function of VERBATIM.
( ( ( ( ( ( ( The work ) ( in question ) ) ( offers ( nothing ( regarding language ) ) ) ) , ) so ) ( ( its review ) ( here ( is ( ancillary ( to ( ( the ( main function ) ) ( of VERBATIM ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (NP (DT The) (NN work)) (PP (IN in) (NP (NN question)))) (VP (VBZ offers) (NP (NP (NN nothing)) (PP (VBG regarding) (NP (NN language)))))) (, ,) (IN so) (S (NP (PRP$ its) (NN review)) (ADVP (RB here)) (VP (VBZ is) (ADJP (JJ ancillary) (PP (TO to) (NP (NP (DT the) (JJ main) (NN function)) (PP (IN of) (NP (NNP VERBATIM)))))))) (. .)))
Reviewing this book isn't the main point of Verbatim.
( ( Reviewing ( this book ) ) ( ( ( is n't ) ( ( the ( main point ) ) ( of Verbatim ) ) ) . ) )
(ROOT (S (S (VP (VBG Reviewing) (NP (DT this) (NN book)))) (VP (VBZ is) (RB n't) (NP (NP (DT the) (JJ main) (NN point)) (PP (IN of) (NP (NNP Verbatim))))) (. .)))