Complex sentence: The river in 1857 had banks and bed of rock and stone, the town was located near where the river flowed over a four foot rock ledge called the "Falls of Nemaha" for which the town was named.
Split into simpler sentences: The river in 1857 had banks and bed of rock and stone. The town was located near where the river flowed over a four-foot rock ledge called the "Falls of Nemaha", for which the town was named.