Complex sentence: Out of that number, 140 are elected in ten multi-seat territorial constituencies, defined on the basis of existing county borders, with necessary amendments to achieve a uniform number of eligible voters in each constituency (within five percent).
Split into simpler sentences: Out of that number, 140 are elected in ten multi-seat territorial constituencies. These are defined on the basis of existing county borders, with necessary amendments to achieve a uniform number of eligible voters in each constituency (within five percent).