Complex sentence: In 1961, the East German government under Walter Ulbricht erected a barbed-wire barrier around West Berlin, officially called the "antifaschistischer Schutzwall" (anti-fascist protective barrier).
Split into simpler sentences: In 1961, the East German government under Walter Ulbricht erected a barbed-wire barrier around West Berlin. It was officially called the "antifaschistischer Schutzwall" (anti-fascist protective barrier).