Complex sentence: Henry Hagg Lake (also Hagg Lake) is an artificial lake in northwest Oregon, United States, which is an impoundment of Scoggins Creek which drains a small portion of the eastern side of Northern Oregon Coast Range.
Split into simpler sentences: Henry Hagg Lake (also Hagg Lake) is an artificial lake in northwest Oregon, in the United States. The reservoir is an impoundment of Scoggins Creek, which drains a small portion of the eastern side of the Northern Oregon Coast Range.