Complex sentence: It consisted of the American, British, and French occupation sectors established in 1945 and shared economic, political, legal, and sporting systems with West Germany, but was not "de jure" part of it.
Split into simpler sentences: It consisted of the American, British, and French occupation sectors established in 1945. It shared economic, political, legal, and sporting systems with West Germany, but was not "de jure" a part of it.