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Function StringArray(t As String) As String()
    StringArray = Split(t, ",")
End Function

Sub SplitThenJoin()
Dim s As String, i As Integer, j As Integer, k As Integer
Dim a() As String, r As Range, rAll As Range
With Worksheets("Sheet1")
    Set rAll = .Range("A2", .Range("A" & Rows.Count).End(xlUp))
End With
For Each r In rAll
    a = StringArray(r.Value)
    For i = 0 To UBound(a)
        j = InStr(1, a(i), "-")
        If IsNumeric(Left(a(i), 1)) And j > 0 Then
                For k = Left(a(i), j - 1) To Mid(a(i), j + 1, 255)
                    s = s & k & ","
                Next k
        ElseIf j > 0 Then
            For k = Asc(Left(a(i), j - 1)) To Asc(Mid(a(i), j + 1, 255))
                s = s & Chr(k) & ","
            Next k
        End If
        If Len(s) > 1 Then
            a(i) = Left(s, Len(s) - 1)
        Else
            a(i) = a(i)
        End If
         s = ""
    Next i
    r = Join(a, ",")
Next r
End Sub