The Editor uses Xpath (right-click in code view) in the same way as on the convert Look&Feel page. If the existing code doesn't easily lend itself to the Xpath approach, I guess you could also use a kind-of-Sigil-split-marker-type approach by using regex to insert some <h2></h2> or <h3></h3> dummy headers (if they don't already exist), then remove them after the split.
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