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You probably want longer sentences when your hero is relaxing between crisis points and considering how they got where they are and what to do next.
You want short sentences when the action is intense.
Literary works tend to have long sentences, while genre fiction (Romance, Fantasy, Mystery, Sci-Fi) use short sentences.
This analysis highlights sentences that are very long. Decide whether the long sentences needs to be that long or if you should break them up.
The maximum sentence length can be defined in the General Preferences dialog.