Complex sentence: The population of Sivand decreased from some 6,000 in 1950 to its present approximately 200 as a result of most of its young population leaving for cities in pursuit of higher education; some Sivandi's also emigrated, mostly to Europe and the United States of America.
Split into simpler sentences: The population of Sivand decreased from 6,000 to 200 from 1950 to the present, as most of its young population left for cities in pursuit of higher education. A number of Sivandi's also emigrated to Europe and the United States of America.