I believe the following code will do what you expect it to:
Sub foo()
Dim ws As Worksheet: Set ws = Sheets("Sheet1")
'declare and set you worksheet
LastRow = ws.Cells(ws.Rows.Count, "A").End(xlUp).Row
'get the last row with data on column A
For i = 1 To LastRow 'loop from row 1 to last
ValueList = Split(ws.Cells(i, 1).Value, vbLf) 'split next line values into array
For x = LBound(ValueList) To UBound(ValueList) 'loop through array
pos = InStrRev(ValueList(x), "/") 'get the position of the last /
ValueList(x) = Right(ValueList(x), Len(ValueList(x)) - pos) 'remove everything before the last /
ws.Cells(i, 2).Value = ws.Cells(i, 2).Value & vbLf & ValueList(x) 'pass the newly created values into Column B
Next x
Next i
End Sub