Final answer:
Nelson Mandela was sentenced to 27 years in prison after being convicted for treason and other charges. His release in 1990 was a turning point that led to the dismantling of apartheid and his eventual election as South Africa's first black president in 1994.
Step-by-step explanation:
The result of Nelson Mandela's trial for conspiracy led to his imprisonment for 27 years. Convicted for treason, illegally leaving the country, and sabotage, Mandela was incarcerated during a period when South Africa was under the oppressive regime of apartheid. His release in 1990 marked the beginning of the end for apartheid, leading to the establishment of a multiracial government, and in 1994, Mandela himself was elected as the first black president of South Africa, symbolizing a major stride towards equality and democracy in the country.