Question : A3 pdf contains 2 pages (landscape) I want to convert it to 2 A4 pages but can't

Dear Experts,
I have an unrestricted pdf that contains 2 A4 pages horizontally next to each other.
Overall 4 pages.
I would like to split those up into 4 portrait A4 pages.
See attached file for details.
Is that possible somehow?
Thanks!

Answer : A3 pdf contains 2 pages (landscape) I want to convert it to 2 A4 pages but can't

You can do it with the crop tool, save each cropped pdf, then combine them again.
You will find the crop tool under the Document menu  > Crop pages command, or I find it easier to use the Tools menu > Advanced editng > crop tool