Complex sentence: The Kaditz flood channel passes by the town to the south, constructed between 1918 and 1922 as part of flood prevention in Dresden on the site of an abandoned channel of the Elbe, which was eroding due to flooding at high water.
Split into simpler sentences: The Kaditz flood channel passes by the town to the south. It was constructed between 1918 and 1922 as part of flood prevention in Dresden on the site of an abandoned channel of the Elbe, which was eroding due to flooding at high water.