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Open up the epub in Sigil and run validation there. Most of them are easily solved. On of the issues you are having, is that you are using HTML instead of XHTML. There some differences. Sigil will help you here.
You can also try opening you first HTML from Word in Sigil and do the splitting there.
Just as a reminder, if you save HMTL from Word, do use the 'filtered HTML' option. It will save tons of garbage in the file.
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