said by Daemon:You'd likely have to use the software that created the PDF to export directly to epub. Or remake the newsletter from scratch in Pages. Unfortunately, Pages is not a very sophisticated epub creator. (Or word processor, really)
I actually
did create it from scratch in Pages. I've tried exporting from Pages as an epub. I've exported it as a PDF from Pages, and then used something called FlipBook and something else called Calibre to create an ebook out of the PDF. I ended up with the same result...scattered images, text, and color blocks.
I've tried googling this rather than bother people here with it, but I didn't see anything related to a flippable newsletter.