The tag should scroll across if you give it a chance. It’s possible there is a 32-character limit–that is a lot of characters for an artist name.
Try mp3tag tagging software. Download the current version’s setup.exe file, not any other junkware that might appear on your screen.
http://www.mp3tag.de/en/download.html
When installing let it add itself to context menus so you can right-click and album folder and open it with mp3tag. Under Tools/Options/Tags/Mpeg choose ID3v2.3 ISO-8859-1. Just highlight your current tags and Save them and they’ll be fixed. Or with the tracks in playing order from top to bottom, use the Auto-Numbering Wizard with leading zeroes, which makes the track numbers 01, 02, etc. Otherwise, 1, 11,12, etc. will play before 2.
The Sansas are a little too picky about tags. ID3v2.3 is preferred. ID3v2.2 usually works. ID3v2.4 is problematical.
