Quite simply
$ObjectsToCreate=import-csv groups.csv
foreach ($Object in $ObjectsToCreate)
{
new-msolgroup -description $Object.description -Displayname $Object.name -managedby "anonit@anonit.net" -tenantid 36e0e315-9f63-497e-aca1-58b47254c2aa
}
Also…. lets not forget that the powershell command new-guid exists!