This By Request VBS Script will provide you with an example of how to separate WMI Class stings that are separated by forward spaces (\). The user also requested a simple way to reverse the output and that script is included as well.
VBS Script:
strComputer = "."
Set objWMIService = GetObject("winmgmts:\\" & strComputer & "\root\cimv2")
Set colItems = objWMIService.ExecQuery("Select * from Win32_ComputerSystem")
For Each objItem in colItems
ArrayName = Split(objItem.UserName, "\")
MsgBox ArrayName(0) 'DomainName
MsgBox ArrayName(1) 'User Name
Next
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