Complex sentence: NAD83 was officially adopted by the U.S. government in 1989, and by the Canadian government in 1990; under the new system, Meades Ranch lost its special standing, and became one of thousands of stations.
Split into simpler sentences: NAD83 was officially adopted by the U.S. government in 1989, and by the Canadian government in 1990. Under the new system, Meades Ranch lost its special standing, and became one of thousands of stations.