Complex sentence: The Vlachs represented a significant part of population of today's Lika and Šibenik-Knin County and a significant Vlach population lived on the territory of the Nelipić family.
Split into simpler sentences: The Vlachs represented a significant part of population of today's Lika and Šibenik-Knin County. A significant Vlach population lived on theterritory of the Nelipić family.