Complex sentence: A portion of the neighborhood gets its nickname of "The Bottoms" because much of the land lies below the level of the Scioto and Olentangy rivers, and a flood wall is required to contain the rivers and protect the area from devastating floods.
Split into simpler sentences: A portion of the neighborhood earned the nickname "The Bottoms" because much of the land lies below the level of the Scioto and Olentangy rivers. A flood wall is required to contain the rivers and protect the area from devastating floods.