sentences:  At the end of the 1980s, the Bertelsmann Stiftung offices were built opposite the Bertelsmann corporate headquarters.Mikhail Gorbachev was a guest during his first trip to Germany after the demise of the Soviet Union.In addition to Reinhard Mohn, Ulrich Saxer and Werner Weidenfeld were appointed to the Bertelsmann Stiftung executive board in 1993.