One more step - if copy/pasting your hmtl code in to sigil xhtml pages in sigil code display mode does paste in, afterwards try the Sigil 'cleaning with html tidy' from the Tools menu.
Sigil might pop up a window saying the code has errors, and ask if you want to fix automatically, or manually.
experiment.
I just did, the result is not what I'd want but it did work - sorta.
Or, search the web for a convertor, I believe there are some out there.
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