Complex sentence: Violence broke out in June 1994, when riot police used tear gas on 1,500 demonstrators who had organized a sit-in front of Ministry of Labor protesting the increasing rate of unemployment which had reached 15 percent.
Split into simpler sentences: Violence broke out in June 1994 when riot police used tear gas on 1,500 demonstrators who had organized a sit-in in front of the Ministry of Labor. The protesters were campaigning against the increasing rate of unemployment, which had reached 15 percent.