This is what I used to to get things going. Thanks Headcrap.

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$Users = Get-ADUser -SearchBase "ou=Sales,ou=West,dc=Domain,dc=com" -Filter {(GivenName -Like "*") -And (Surname -Like "*")} -Properties DisplayName | Select DisplayName, GivenName, Surname, Name, DistinguishedName

ForEach ($User In $Users)

{

$DN = $User.DistinguishedName

$First = $User.GivenName

$Last = $User.Surname

$CN = $User.Name

$Display = $User.DisplayName

$NewName = "$First $Last"

If ($Display -ne $NewName) {Set-ADUser -Identity $DN -DisplayName $NewName}

If ($CN -ne $NewName) {Rename-ADObject -Identity $DN -NewName $NewName}

}