I replied to a similar Q earlier. Merge PDF to ePub.

After you create an EPUB, you would need to use Kindle Previewer to turn it into mobi and eventually load it onto a Kindle.

Your task may be easy, or laborious, depending on the internals of your PDF file. That is dependent on "how" the PDF was created in the first place, which might not have been under your control.

From my experience, if the PDF was created from a scanned document, you'll have to do quite a bit of review and manual editing, which doesn't meet your desire for the 'simple way.'

I replied to a similar Q earlier. Merge PDF to ePub.

After you create an EPUB, you would need to use Kindle Previewer to turn it into mobi and eventually load it onto a Kindle.

Your task may be easy, or laborious, depending on the internals of your PDF file. That is dependent on "how" the PDF was created in the first place, which might not have been under your control.

From my experience, if the PDF was created from a scanned document, you'll have to do quite a bit of review and manual editing, which doesn't meet your desire for the 'simple way.'