I don't know of any way to do this in Excel but here's a thought. Export the data to a .csv file and use find and replace to replace <@> with <,@,>. You can then import the result into a new spreadsheet.
OnePlus 5T review: Hands-on
Illustrator Andrés Lozano on his improv line work, brazen use of colours & hand sketching
iPhone X review
Comment envoyer gratuitement des gros fichiers ?