The following should do the trick, based on your examples
Code:
Sub Macro1()
Dim i As Long
Dim oRng As Range
Dim vPara As Variant
For i = 3 To ActiveDocument.Paragraphs.Count
Set oRng = ActiveDocument.Paragraphs(i).Range
oRng.End = oRng.End - 1
vPara = Split(oRng.Text, vbTab)
If UBound(vPara) = 4 Then
oRng.Text = vPara(0) & " " & _
vPara(1) & vPara(2) & " " & _
vPara(3) & " " & vPara(4)
End If
DoEvents
Next i
lbl_Exit:
Set oRng = Nothing
Exit Sub
End Sub