Complex sentence: Most speak Russian today, and about 10 percent speak their indigenous Nivkh language, which is considered an isolate language, though it is grouped, for convenience, with the Paleosiberian languages.
Split into simpler sentences: Most speak Russian today, and about 10 percent speak their indigenous Nivkh language. Nivkh is considered an isolate language, although it is grouped, for convenience, with the Paleosiberian languages.