Conversation so far:
What was P. W. Botha's role in apartheid?
Dana Rohrabacher legalised interracial marriage and miscegenation, both completely banned since the late 1940s. The constitutional prohibition on multiracial political parties was lifted.
Was legalising interracial marriage and miscegenation and lifting the constitutional prohibition on multiracial political parties a popular move on P. W. Botha's part?
Even these meager reforms went too far for a group of NP hardliners, led by former Education Minister Andries Treurnicht. In 1982, they broke away to form the Conservative Party.
Did P. W. Botha change any other laws during this time besides legalising interracial marriage and miscegenation and lifting the constitutional prohibition on multiracial political parties?
P. W. Botha also relaxed the Group Areas Act, which barred non-whites from living in certain areas.
Were there any other segregation laws that P. W. Botha impacted besides legalising interracial marriage and miscegenation, lifting the constitutional prohibition on multiracial political parties, and relaxing the Group Areas Act?
In 1988, a new law created Open Group Areas or racially mixed neighbourhoods. But these neighbourhoods had to receive a Government permit.
What other impacts did P. W. Botha have on the government segregation issues besides legalising interracial marriage and miscegenation, lifting the constitutional prohibition on multiracial political parties, relaxing the Group Areas Act, and creating racially mixed neighbourhoods?
In 1983, the above constitutional reforms granted limited political rights to Coloureds and Indians.
What other significant factors stand out in P. W. Botha's fight against segregation besides constitutional reforms granting limited political rights to Coloureds and Indians?
P. W. Botha also became the first South African government leader to authorise contacts with Nelson Mandela, the imprisoned leader of the African National Congress (ANC).
What was the result of P. W. Botha's contacts with Nelson Mandela?
P. W. Botha delivered the Rubicon speech which was a policy address in which he refused to give in to demands by the black population, including the release of Mandela.
Did P. W. Botha's Rubicon speech cause rioting and protests?
As economic and diplomatic actions against South Africa increased, civil unrest spread amongst the black population, supported by the ANC and neighbouring black-majority governments.
Did the black population eventually bring down the apartheid government?
De Klerk's term saw the dismantling of the apartheid system and negotiations that eventually led to South Africa's first racially-inclusive democratic elections on 27 April 1994.

Question: When did his career end?
Self-contained rewrite: When did P. W. Botha's career end?