If there isn’t at least some separator indication (ie just continuous paragraphs) then, in Sigil, you would just manually insert the split marker wherever (after every x number of paragraphs). You could then run a report which would tell you how many KBs are in each file; then add an additional split if files are too large. This is an (outdated?) concern, as most readers/devices don’t have that old file size limit anymore.
However, the point I think you are trying to make is that Calibre has a splitting-on-size function.
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