Complex sentence: South Africa has had a history of such events, as the AWB were responsible for several assassinations and attacks during the late 1980s and early 1990s, before its leader, Eugene Terre'Blanche, was imprisoned.
Split into simpler sentences: South Africa has had a history of such events. The AWB were responsible for several assassinations and attacks during the late 1980s and early 1990s, before its leader, Eugene Terre'Blanche, was imprisoned.