$datas = Get-ChildItem -Path "D:\Testdata"

foreach($data in $datas){
    $datasplit = $data.Name.Split(" ")
    $newname = ""
    $i=0
    foreach($split in $datasplit){
        if($i -gt 1){
            $newname += " $split"
        }
        elseif($i -eq 1){
            $newname = $split
        }
        $i++
    }
    Rename-Item -Path $data.FullName -NewName $newname
}