Complex sentence: Wingas GmbH is a gas distribution, transport and storage company located in Kassel, Germany, established in 1993 by BASF subsidiary Wintershall Holding AG and Gazprom.
Split into simpler sentences: Wingas GmbH is a gas distribution company located in Kassel, Germany. It was established in 1993 by BASF subsidiary Wintershall Holding AG and Gazprom.