​A.) Who worked together to change the way South Africa was governed?

Many countries criticized South Africa of its apartheid policy.

So its president, F.W. de Klerk decided to end the apartheid and released activists 

who had been imprisoned due to opposing against it. Mandela was one of the freed. 

Then Mr.Klerk and Mr.Mandela worked together to chang the way South Africa was governed.

=>  Many countries criticized South Africa for its apartheid policy.

So its president, F.W. de Klerk decided to end the apartheid and released activists 

who had been imprisoned due to opposing the policy. Mandela was one of the freed. 

Then Mr. Klerk and Mr. Mandela worked together to change the way South Africa was governed.​

​•  Corrected: The sentences are corrected grammatically.