Easiest way to make multi-page images in Microsoft Word?

If you need to just print this document, you can do this by pasting into Excel. Lines will appear that will show you where the split occurs. I use this when people send me long images.

Paste them into multiple pages and crop them.

Crop each one from the top by a multiple of the (visible) page length, so crop the second one by (say) 27 cm, the third by 54, etc. You don't say which version of Word you have, but the options for specific crop measurement are in the "size" dialog for the picture (rather than doing this by hand)