Complex sentence: With the extension of the channelization and subsequent development of the Wüste the Pappelgraben was rebuilt and extended from around 1960; today it runs to the rainwater retention basin at Hörner Bruch.
Split into simpler sentences: With the extension of the channelization and subsequent development of the Wüste, the Pappelgraben was rebuilt and extended from 1960 onwards. Today it runs to the rainwater retention basin at Hörner Bruch.