Complex sentence: Since 1775 and even longer due to the Pima villages, Tucson has always been inhabited, unlike several other Spanish settlements in the area, at this time at least seventy-five percent of Tucson was inhabited by native Americans.
Split into simpler sentences: Since 1775 and even longer due to the Pima villages, Tucson has always been inhabited, unlike several other Spanish settlements in the area. At this time at least seventy-five percent of Tucson was inhabited by native Americans.