Split text in cells at line breaks

Try with this code:

Sub JustDoIt()
    'working for active sheet
    'copy to the end of sheets collection
    ActiveSheet.Copy after:=Sheets(Sheets.Count)
    Dim tmpArr As Variant
    Dim Cell As Range
    For Each Cell In Range("AJ1", Range("AJ2").End(xlDown))
        If InStr(1, Cell, Chr(10)) <> 0 Then
            tmpArr = Split(Cell, Chr(10))

            Cell.EntireRow.Copy
            Cell.Offset(1, 0).Resize(UBound(tmpArr), 1). _
                EntireRow.Insert xlShiftDown

            Cell.Resize(UBound(tmpArr) + 1, 1) = Application.Transpose(tmpArr)
        End If
    Next
    Application.CutCopyMode = False
End Sub

BEFORE-----------------------------------------AFTER

Use =SUBSTITUTE(A1,CHAR(10),";") to replace line-breaks with ";" or some other delineator so the text-to-column can parse it for you with one of the available delineators.