Gee, which part don't you understand?
Not too many radiologists here. I can tell you a few things, but you will need some medical reference or a doctor to help you translate that into English.
I have no idea what polypoid mucoperiosteal thickening is, but apparently the radiologist thinks you have some sinus disease on the right side.
The "non-specific white matter changes" show up on many MRIs (mine had one). I think they report them so they can be watched over time, and checked again if you have another MRI.