Original: Reforms to apartheid in the 1980s failed to quell the mounting opposition , and in 1990 President Frederik Willem de Klerk began negotiations to end apartheid , culminating in multi-racial democratic elections in 1994 , which were won by the African National Congress under Nelson Mandela .
Simplified: The last president of the Apartheid regime was Frederik Willem de Klerk , the first non-white president was Nelson Mandela .