Complex sentence: Most speak Russian today, though about 10 percent speak their indigenous language Nivkh which is considered an isolate language connected to the Paleosiberian languages, divided into four dialects, Mattissen, p.515 though they are sometimes grouped with the nearby Chukotko-Kamchatkan and Altaic languages.
Split into simpler sentences: Most speak Russian today, though about 10 percent speak their indigenous Nivkh language, which is considered an isolate language, though for convenience grouped with the Paleosiberian languages. The Nivkh language is divided into four dialects, Mattissen, p.515 though they are sometimes grouped with the nearby Chukotko-Kamchatkan and Altaic languages.