Complex sentence: The criticizers of the Finno-Ugric and Uralic language groups say, that the languages of these "groups" are clearly related by agglutination and the features, that are common among the turanian (Sumerian) agglutinating languages.
Split into simpler sentences: The criticizers of the Finno-Ugric and Uralic language groups say, that the languages of these "groups" are related. They are clearly related by agglutination and the features, that are common among the turanian (Sumerian) agglutinating languages.