Excel - Outlook - how to put multiple ranges

[DonAndress]

Hello.

On Microsoft's site I have found below code for sending a range of cells in the Outlook message body:

Sub Mail_Selection_Range_Outlook_Body()
    
    Dim rng As Range
    Dim OutApp As Object
    Dim OutMail As Object

    Set rng = Nothing
    
    On Error Resume Next
     Set rng = Sheets("Sheet1").Range("D9:R40").SpecialCells(xlCellTypeVisible)
    On Error GoTo 0

    If rng Is Nothing Then
        MsgBox "The selection is not a range or the sheet is protected. " & _
               vbNewLine & "Please correct and try again.", vbOKOnly
        Exit Sub
    End If

    With Application
        .EnableEvents = False
        .ScreenUpdating = False
    End With

    Set OutApp = CreateObject("Outlook.Application")
    Set OutMail = OutApp.CreateItem(0)

    On Error Resume Next  
    
    With OutMail
        .To = ""
        .CC = ""
        .BCC = ""
        .Subject = "This is the Subject line"
        .HTMLBody = RangetoHTML(rng)
        .Display
'        .Send
    End With
      
    On Error GoTo 0

    With Application
        .EnableEvents = True
        .ScreenUpdating = True
    End With

    Set OutMail = Nothing
    Set OutApp = Nothing
    
End Sub



Function RangetoHTML(rng As Range)
    
    
    Dim fso As Object
    Dim ts As Object
    Dim TempFile As String
    Dim TempWB As Workbook


    TempFile = Environ$("temp") & "/" & Format(Now, "dd-mm-yy h-mm-ss") & ".htm"
 
 
    ' Copy the range and create a workbook to receive the data.
    rng.Copy
    Set TempWB = Workbooks.Add(1)
    With TempWB.Sheets(1)
        .Cells(1).PasteSpecial Paste:=8
        .Cells(1).PasteSpecial xlPasteValues, , False, False
        .Cells(1).PasteSpecial xlPasteFormats, , False, False
        .Cells(1).Select
        Application.CutCopyMode = False
        On Error Resume Next
        .DrawingObjects.Visible = True
        .DrawingObjects.Delete
        On Error GoTo 0
    End With
 
    ' Publish the sheet to an .htm file.
    With TempWB.PublishObjects.Add( _
         SourceType:=xlSourceRange, _
         Filename:=TempFile, _
         Sheet:=TempWB.Sheets(1).Name, _
         Source:=TempWB.Sheets(1).UsedRange.Address, _
         HtmlType:=xlHtmlStatic)
        .Publish (True)
    End With
 
    ' Read all data from the .htm file into the RangetoHTML subroutine.
    Set fso = CreateObject("Scripting.FileSystemObject")
    Set ts = fso.GetFile(TempFile).OpenAsTextStream(1, -2)
    RangetoHTML = ts.ReadAll
    ts.Close
    RangetoHTML = Replace(RangetoHTML, "align=center x:publishsource=", _
                          "align=left x:publishsource=")
 
    ' Close TempWB.
    TempWB.Close savechanges:=False
 
    ' Delete the htm file.
    Kill TempFile
 
    Set ts = Nothing
    Set fso = Nothing
    Set TempWB = Nothing
End Function

Now, how to change this code so I could put multiple ranges in the mail body?
Let's say, I have two ranges like that:

Sheets("Sheet1").Range("D9:R40")
Sheets("Sheet1").Range("D50:R70")