Complex sentence: The P-19 was operated by the Soviet Union from 1974 and though it has since become obsolete it was passed down to successor states after the fall of the Soviet Union, it has been exported and continues to serve around the world.
Split into simpler sentences: The P-19 was operated by the Soviet Union from 1974 and though it has since become obsolete, it was passed down to successor states after the fall of the Soviet Union. It has been exported and continues to serve around the world.