Judging from his latest insult to trees, Dan Brown has apparently tried to read Dante, and yet his sentences are still stacked like so many corpses.Source
What does the writer mean here?
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As snailboat mentions, the reviewer regards Dan Brown's novels as an insult to trees (which gave their lives that the books might be printed).
The phrase “sentences are still stacked like so many corpses” suggests that the writing is dead and lifeless.