The best way to do this is to do a Save as with the PDF to a Word Document first and then format the Word Document into two pages and then RE-PDF it. That is assuming the PDF can be altered. If it can not be altered, the best way is to print the PDF to a new file from one page per sheet to two pages per sheet.
Here is a PDF that is split between two pages and made into two printable files. I have included the original PDF that I purchased for this tutorial. Once again, I would highly recommend doing the above process. If you have any questions on using these PDFs, feel free to leave a comment. You can Download our FREE Kindle e-book on Book Cover Design from Amazon.com. I hope that you have found this helpful. Thank you for reading.