Option Explicit
Sub MainProcedure()
  Application.ScreenUpdating = False
  'Do things
  'Do things
  'Call the CompoundCR procedure for the main text then footnotes
  CompoundCRs ActiveDocument.Range
  CompoundCRs ActiveDocument.StoryRanges(wdFootnotesStory)
  'Do things or call other procedures
  Application.ScreenUpdating = True
  Selection.HomeKey Unit:=wdStory
  MsgBox "Complete"
lbl_Exit:
  Exit Sub
End Sub
Sub CompoundCRs(oRngPassed As Range)
Dim strTerms As String
Dim arrTerms() As String
Dim lngIndex As Long, lngOffset As Long
Dim bCompound As Boolean
Dim oRng As Range, oRngEval As Range

  strTerms = "[Aa]rticle,[Aa]ppendix,[Cc]lause,[Pp]aragraph,[Pp]art,[Ss]chedule" 'highlight numbers after these words
  arrTerms = Split(strTerms, ",")
  On Error GoTo Err_Handler
  Set oRng = oRngPassed.Duplicate
  'The reason the one instance with the non-breaking space was missed is because you had a non-breaking and normal space (2 spaces)
  With oRng.Find
    .ClearFormatting
    .Replacement.ClearFormatting
    .Forward = True
    .Wrap = wdFindStop
    .MatchWildcards = True
    .Text = "[ ^s]{2,}"
    .Replacement.Text = " "
    .Execute Replace:=wdReplaceAll
  End With
  For lngIndex = 0 To UBound(arrTerms)
    Set oRng = oRngPassed.Duplicate
    With oRng.Find
      .ClearFormatting
      .Replacement.ClearFormatting
      .Forward = True
      .Wrap = wdFindStop
      .MatchWildcards = True
      .Text = arrTerms(lngIndex) & "[s ^s]@[0-9.]{1,}"
      Do While .Execute
        oRng.MoveStart wdWord, 1
        oRng.HighlightColorIndex = wdBrightGreen
        oRng.Collapse wdCollapseEnd
        bCompound = True
        Do While bCompound
          Set oRngEval = oRngPassed.Duplicate
          oRngEval.Start = oRng.End
          Select Case True
            Case InStr(oRngEval, "-") = 1
              oRng.Move wdCharacter, 1
              lngOffset = 0
            Case InStr(oRngEval, ", ") = 1
               oRng.Move wdCharacter, 2
               lngOffset = 0
            Case InStr(oRngEval, " - ") = 1
              oRng.Move wdCharacter, 3
              lngOffset = 3
            Case InStr(oRngEval, " or ") = 1
              oRng.Move wdCharacter, 4
              lngOffset = 4
            Case InStr(oRngEval, " to ") = 1
              oRng.Move wdCharacter, 4
              lngOffset = 4
            Case InStr(oRngEval, " and ") = 1
              oRng.Move wdCharacter, 5
              lngOffset = 5
            Case InStr(oRngEval, " and/or ") = 1
              oRng.Move wdCharacter, 8
              lngOffset = 8
            Case Else
              bCompound = False
          End Select
          If bCompound Then
            oRng.MoveEnd wdCharacter, 1
            Do While IsNumeric(oRng.Characters.Last.Next) Or (oRng.Characters.Last.Next = "." And IsNumeric(oRng.Characters.Last.Next.Next))
              oRng.MoveEnd wdCharacter, 1
            Loop
            If IsNumeric(oRng.Characters.First.Text) Then oRng.HighlightColorIndex = wdBrightGreen
            oRng.Collapse wdCollapseEnd
            If lngOffset > 0 Then
              oRng.Move wdCharacter, -lngOffset
            End If
          End If
        Loop
      Loop
     End With
Next_For:
  Next
lbl_Exit:
  Exit Sub
Err_Handler:
  MsgBox Err.Number & " - " & Err.Description
  Resume Next_For
End Sub

For Each oRng In ActiveDocument.StoryRanges
With oRng
Select Case .StoryType
Case wdMainTextStory, wdFootnotesStory