Complex sentence: Kazakhstan was the last of the Soviet republics to declare independence following the dissolution of the Soviet Union in 1991; the current President, Nursultan Nazarbayev, has been leader of the country since then.
Split into simpler sentences: Kazakhstan was the last of the Soviet republics to declare independence following the dissolution of the Soviet Union in 1991. The current President, Nursultan Nazarbayev, has been leader of the country since then.