Complex sentence: In the 19th century, white settlers cleared much of the land for farming, and the stream is named for one of these newcomers, William Johnson, who in 1846 built a water-powered sawmill along the creek.
Split into simpler sentences: In the 19th century, white settlers cleared much of the land for farming. The stream is named for William Johnson, a settler who in 1846 built a water-powered sawmill along the creek.