Excel split cell to Rows

Would you provide an example of what you expect the result to look like?

Hello,
Tab 1, before
Tab 2, After

thanks

No attachment.

please see attached.
Sample.xlsx

This will remove the _ in the front

Sub removetrailingunderscore()
Dim mywb As Workbook
Dim myws_Bef As Worksheet
Dim myws_Aft As Worksheet
Dim myval As String
Dim c As Range
Dim rng As Range

Set mywb = Application.ActiveWorkbook
Set myws_Bef = mywb.Sheets("Before")
Set myws_Aft = mywb.Sheets("After")
Set rng = Range(Cells(2, "AW"), Columns("AW").End(xlDown))
'Remove _ from beginning of AW
For Each c In rng
    c.Value = Right(c.Value, Len(c) - 1)
    'MsgBox c.Value
Next
'Format as number
Columns("AW:AW").Select
Selection.NumberFormat = "0"

End Sub

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Try this to split the strings with the space in between

Sub splitcellatspace()
Dim mywb As Workbook
Dim myws_Bef As Worksheet
Dim myws_Aft As Worksheet
Dim myval As String
Dim c As Range
Dim rng As Range
Dim str1() As String
Dim str2() As String
Dim strX() As String
Dim Sx() As String
Dim avarsplit As Variant

Set mywb = Application.ActiveWorkbook
Set myws_Bef = mywb.Sheets("Before")
Set myws_Aft = mywb.Sheets("After")
Set rng = Range(Cells(2, "AW"), Columns("AW").End(xlDown))

RowCount = 0

For Each c In rng
    c.Activate
    RowCount = RowCount + 1
    avarsplit = c.Value
    If InStr(1, avarsplit, " ") > 0 Then
            Sx = Split(avarsplit, " ")
            If LBound(Sx) - UBound(Sx) <> 0 Then
            For i = LBound(Sx) To UBound(Sx)
               ActiveCell.Offset(i + 1, 0).EntireRow.Insert shift:=xlDown
               c.Offset(i, 0).Value = Sx(i)
            Next
            End If
    End If
Next
End Sub

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Hi XTermie,
First code to  removetrailingunderscore
it's eating some numbers from the end.
Example, Row 3
_99999199000290999
becomes
99999199000290900

Second Code to splitcellatspace, splitcellatcomma
it's not coyping the other columns data along with the new rows.

Also,
if the number has brackets, it should stay together with the number following it.
Example Row 8, 9
_9992999090009909999 (9922029) 9909999219919902
Should become
9992999090009909999
(9922029) 9909999219919902

_990099129290, 9900991292999 (9922921) 00299992102229902
Should become
990099129290
9900991292999
 (9922921) 00299992102229902


Thank you very much for your help.

Thank you