Complex sentence: The multinational corporation Endesa proposed a large-scale hydroelectric project on the Chilean side of the Futaleufú watershed, which would have built three dams, quelling the river's free flow and covering many of the rapids with a series of reservoirs.
Split into simpler sentences: The multinational corporation Endesa proposed a large-scale hydroelectric project on the Chilean side of the Futaleufú watershed. The Endesa proposal would have built three dams, quelling the river's free flow and covering many of the rapids with a series of reservoirs.