After looking at the file, I can see that the problem is that you don’t have any styles for the text in the document. All of the text is using the “Normal” style with local overrides to the text. This will always produce spans around all of the content which explains what you were seeing. I created a few styles for the first several lines of copy in your file, and you’ll see that if you export the file to PDF now, there are no spans. Keep in mind that these <span> tags are not a failure condition but it does make for messy tags. Always use styles in InDesign, not just for accessibility, but for efficient and consistent formatting as well. hope that helps!
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