Additional cropping tools that can also be used for a two-page(double page) spread splitting :
pdfscissors
https://sites.google.com/site/pdfscissors/
briss
http://briss.sourceforge.net
Javascript-to-automatically-split-pages-in-adobe-acrobat
https://www.mobileread.com/forums/sh...d.php?t=148777
There are probably some pdf editors with such duble-page layout cropping/splitting command(s) incorporated therein, but we can usually use any pdf editor with a basic crop function, by cropping the left and the right sides separately and then by merging those cropped pages together thereafter, like this;
https://help.uberflip.com/hc/en-us/a...le-Page-Format
There are probably ereader/tablet pdf apps that could be used instead e.g. I remember using koreader app on my kindleDX for double-page-PDF comics, but it is pretty easy and quick to use briss, pdfscissors etc. and probably easier on the readers processor or memory thereafter.
There were also quite a few online services too and some linux(Ubuntu) tools, but I have not checked them over
https://www.sejda.com/split-pdf-down-the-middle
https://askubuntu.com/questions/5685...df-page-in-two