Complex sentence: The Public Order and Police Law of 1900 was supplemented by the Peace Preservation Law of 1925, but remained in effect until the end of World War II, when it was repealed by the American Occupation authorities.
Split into simpler sentences: The Public Order and Police Law of 1900 was supplemented by the Peace Preservation Law of 1925. It remained in effect until the end of World War II, when it was repealed by the American occupation authorities.