I recently started a project converting a magazine's PDFs into a digital reader app. 

Up until now, the PDFs that were given to me were all set up so that each page of the magazine was a separate page of the PDF. 

Recently I have been getting them formatted differently however. Now they are set up so the front and back pages are single pages, but very inside page is set up as a landscape shaped PDF page that contains two different magazine pages per PDF page (I hope that makes sense).

The problem I have is the digital reader app cannot support this and I am at a loss trying to figure out how to split each page.

Any advice?