Complex sentence: This was shown most notably in a bizarre campaign of persecution against the ethnic Turkish minority (10 percent of the population), who were ordered to adopt Bulgarian names: many fled to Turkey, and the issue strained Bulgaria's economic relations with the west.
Split into simpler sentences: This was shown most notably in a bizarre campaign of persecution against the ethnic Turkish minority (10 percent of the population), who were ordered to adopt Bulgarian names. Many fled to Turkey, and the issue strained Bulgaria's economic relations with the West.