At ten there is no need to break it up. A child that age sits down and takes the whole arc in one go — and starts catching the thing that actually makes Gulliver's Travels great: Jonathan Swift did not write an adventure story, he wrote a mockery. So

At seven, a child can handle a story with real conflict but not two hundred pages of it. That is exactly why Gulliver's Travels works so well at this age when it comes in chapters: one a night, each with its own beginning and end, and the voyage