As a convenient function, paste the code in a standard module and enter =SortIt(A1) in a cell.
[vba]
Function SortIt(Data As Range)
Dim ary1
ary1 = Split(Replace(Data, ",", ""), " ")
SortIt = ary1(1) & " " & ary1(0) & ", " & ary1(2)
End Function

[/vba]