Complex sentence: Close to Alexanderplatz, the tower was constructed between 1965 and 1969 by the former German Democratic Republic administration who intended it as a symbol of Berlin, which it remains today, as it is easily visible throughout the central and some suburban districts of Berlin.
Split into simpler sentences: Close to Alexanderplatz, the tower was constructed between 1965 and 1969 by the administration of the German Democratic Republic. It was intended as a symbol of Berlin, which it remains today, as it is easily visible throughout the central and some suburban districts of Berlin.