Complex sentence: The Kalmyks expelled the Nogais who fled to the plains of northern Caucasus and to the Crimea under the Ottoman Empire or joined to Kazakh Khanate as part of Little jüz.
Split into simpler sentences: The Kalmyks expelled the Nogais who fled to the plains of northern Caucasus and to the Crimea under the Ottoman Empire. A few part of them joined to Kazakh Khanate as part of Little jüz.