Translate the following English sentence to French:
"We should remember that Nelson Mandela, winner of the Nobel Prize and of the Sakharov Prize, was imprisoned for 27 years because he refused to condemn the violent actions of the ANC."
N'oublions pas que Nelson Mandela, lauréat du prix Nobel de la paix et du prix Sakarov, a été emprisonné pendant 27 ans car il refusait de condamner les actions violentes de l'ANC.