Complex sentence: Stuck continued racing touring and sports cars all over the world, winning the 24 hours of Le Mans twice with a Porsche 962, was DTM-Champion in 1990 with Audi before returning to Porsche until the 24 hours of Le Mans in 1997.
Split into simpler sentences: Stuck continued racing touring and sports cars all over the world, winning the 24 hours of Le Mans twice with a Porsche 962. In the 1990s he tasted touring car success, winning the DTM Championship in 1990 with Audi, before returning to Porsche until the 24 hours of Le Mans in 1997.