PDFs are usually formatted to fit a page with a specific page layout. The purpose of the document format was to offer a consistent print layout on different systems. That's a long-winded way of saying that what you want is not what the document format was designed to do. So you need to use some sort of trick to get around it but unfortunately I cannot point you in a useful direction other than to experiment with the 'Poster' option in the print dialog of Adobe Acrobat. That will allow you to print a single page across two or more sheets of paper.