Enter the following in cell C2 as an array formula (CTRL-SHIFT-ENTER) and drag it down for as many top sellers as you want:

="Copies sold from No. "&ROW()-1&" Seller: "&INDEX($A$2:$B$100,MATCH(LARGE($B$2:$B$100,ROW()-1),$B$2:$B$100,0),2)
In cell D2, enter the following with CTRL-SHIFT-ENTER and drag down:

="Copies sold from No. "&ROW()-1&" Seller: "&INDEX($A$2:$B$100,MATCH(LARGE($B$2:$B$100,ROW()-1),$B$2:$B$100,0),2)
The formula is currently looking at the range A2 through B100, so you'll need to adjust those values as necessary. Hope this helps.