Complex sentence: Günter Schabowski, the party boss in East Berlin and the spokesman for the SED Politburo, had the task of announcing this; however, he had not been involved in the discussions about the new regulations and had not been fully updated.
Split into simpler sentences: Günter Schabowski, the party boss in East Berlin and the spokesman for the SED Politburo, had the task of announcing the new regulations. However, he had not been involved in the discussions about the new regulations and had not been fully updated.