Original sentence: Finno-Ugric is a group of related languages, which does not necessarily mean that the peoples speaking those languages are equally related in terms of ethnicity.The most widely accepted Finno-Ugric theory from the late nineteenth century is based primarily on linguistic and ethnographical arguments, while it is criticised as relying too much on August Schleicher's Stammbaumtheorie of historical linguistics.The same holds true for Indo-European languages
Edited sentence: Nowadays this theory is contested, as Finno-Ugric-speaking peoples have a wide range of cultural, ethnic and genetic variation, as have Indo-European-speaking peoples.The traditional Finno-Ugric theory of origin from the late nineteenth century is based primarily on linguistic and ethnographical arguments, and it is criticised as relying too much on August Schleicher's Stammbaumtheorie of historical linguistics