You can programmatically split forms using LC Assembler service and use the DDX. You could extract page1 from pdf1 and create a pdf, then page2 of pdf1 into a different PDF using something similar to:
<?xml version="1.0" encoding="UTF-8"?>
<DDX xmlns="http://ns.adobe.com/DDX/1.0/">
<PDF result="Final.pdf">
<PDF source="PDF1.pdf" pages="1"/>
</PDF>
<PDF result="Final2.pdf">
<PDF source="PDF1.pdf" pages="2"/>
</PDF>
</DDX>
To split according to Level 1 bookmarks, you can also use the PDFFromBookmarks tag.
For example,
<PDFsFromBookmarks prefix="stmt">
<PDF source="doc1.pdf"/>
</PDFsFromBookmarks>
More info is available in the Assembler Service and DDX Reference available at http://help.adobe.com/en_US/livecycle/10.0/ddxRef.pdf.
