I’m not aware of a specific node but having done something a while ago to join PDFs using the R snippet node, this should be fairly simple to achieve.
Take a look at this thread
I didn’t know any R when I wrote that and this is still the limit of my R experience but I believe the same toolkit used there is capable of splitting pdf files too.
From memory, I think you will need to have the R pdftools package and qpdf. Have a quick look at that and see if that gives sufficient clues. If you need more assistance post back and I’ll have a play when I have some time.
In the meantime somebody else may know another way.