Complex sentence: Moldavia developed in the lands between the Carpathian Mountains and the Dniester River which had been dominated by nomadic Turkic peoplesthe Pechenegs, Ouzes and Cumansfrom around 900.
Split into simpler sentences: Moldavia developed in the lands between the Carpathian Mountains and the Dniester River. That territory had been dominated by nomadic Turkic peoplesthe Pechenegs, Ouzes and Cumansfrom around 900.