Complex sentence: A proportion of the locals considered that Valduc, while imposing constraints and driving people away from the area, does not bring benefits to the area, since most employees commute from away and the center did not pay local taxes.
Split into simpler sentences: A proportion of the locals considered that Valduc does not bring benefits to the area but imposes constraints and discourages people from coming to the area. This is partly because most employees commute from away and the center did not pay local taxes.