Complex sentence: FortisBC owns four regulated hydro-electric generating plants on the Kootenay River with an aggregate capacity of 223 MW: the Corra Linn, Upper Bonnington, Lower Bonnington, and South Slocan Plants.
Split into simpler sentences: FortisBC owns four regulated hydro-electric generating plants on the Kootenay River with an aggregate capacity of 223 MW. They are the Corra Linn, Upper Bonnington, Lower Bonnington, and South Slocan Plants.