Original sentence: In 1976, anti-communism became morally untenable for the West when the South African government killed 176 people (students and adults) in the suppression of the Soweto uprising (June 1976), which protested Afrikaner cultural imperialism, the imposition of Afrikaans (a European Germanic language) as the language for teaching school and as the language that black South Africans must speak to white people; and the police assassination in September 1977 of Steven Biko, a leader of the internal resistance to apartheid in South Africa.In South Africa, the anti-communist, white-minority government—based upon the official policy of apartheid—caused much geopolitical tension between the Soviet Union and the United States
Edited sentence: In 1976, anti-communism became morally untenable for the West when the South African government killed 176 people (students and adults) in the suppression of the Soweto uprising (June 1976), which protested Afrikaner cultural imperialism, the racist imposition of Afrikaans (a European Germanic language) as the language for teaching school and as the language that black South Africans must speak to white people; and the police assassination in September 1977 of Steven Biko, a leader of the internal resistance to apartheid in South Africa.In South Africa, the anti-communist, white-minority government—based upon the official racism of apartheid—caused much geopolitical tension between the Soviet Union and the United States