Complex sentence: In 1980, BC Hydro began to study the feasibility of building a five-dam project in the Grand Canyon, however the plan quickly led to opposition by conservation groups and a long struggle over the fate of the river.
Split into simpler sentences: In 1980, BC Hydro began to study the feasibility of building a five-dam project in the Grand Canyon. The plan has led to opposition by conservation groups and a long struggle over the fate of the river.