Complex sentence: Bernt Wilmar Carlsson (born 1938 in Stockholm, Sweden) was United Nations Commissioner for Namibia from July 1987 until he died on Pan Am Flight 103 which was destroyed over Lockerbie, Scotland on December 21,1988.
Split into simpler sentences: Bernt Wilmar Carlsson (born 1938 in Stockholm, Sweden) was United Nations Commissioner for Namibia from 1987 to 1988. He died when Pan Am Flight 103 was destroyed over Lockerbie, Scotland on December 21,1988.