Originally Posted by SkyDream
Your PDF is multi-column which is currently out of scope for calibre epub-conversion as i understand. There is work underway for two-column PDF support but this wouldn't help you.
Looking at your PDF i doubt there is any conversion tool which will create a good epub version of your PDF.
I haven't looked the file in question over, since I'm no expert. I have had acceptable results with using Mobipocket Creator to extract the text from two-column PDFs, but that involves some manual editing of the resulting HTML before making into a PRC (which Calibre likes quite well). Maybe I'm overcomplicating my life with this, but I really want all my e-books, both ePub and PDF, in one app if at all possible.