Complex sentence: After desegregation resulting from the African-American Civil Rights Movement in the 1950s and 1960s, HISD had established magnet programs and other alternative education programs, and many black people moved from the Third Ward to the suburbs.
Split into simpler sentences: After desegregation resulting from the African-American Civil Rights Movement in the 1950s and 1960s, HISD had established magnet programs and other alternative education programs. In addition, many black people moved from the Third Ward to the suburbs.