Sigil and calibre epub editors have merge and split features. If I get book split on arbitrary boundaries (usually around 240kb) I merge it into one and split on chapter boundaries. Some ereaders, e.g calibre's 4.1 ebook-reader and the one I use on my phone (can't remember its name - it was abandoned soon after I got it), have features to skip to start/end/next/previous sections (chapters).
BR
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