There are apps for windows that allow cropping pdfs and/or reflowing. I generally avoid the latter and have found that cropping pdf's almost always works well enough.

Most documents have more than enough margin that the final cropped document is then readable on the RM1. (Eventhough I wear readers I don't like to see microtype). Those same programs can also be used to split two column papers.

RM1 has a built in crop tool but I find it slows things down a bit and it won't work to split a two column layout.