The judges broke the Booker Prize rules to split the award on Monday.
"The Testaments" is a sequel to Atwood’s 1985 novel "The Handmaid’s Tale." Evaristo’s "Girl, Woman, Other" tells the stories of 12 different women in the United Kingdom.
This is the second time that Atwood wins the Booker Prize. The first time was in 2000 for the Canadian writer's "The Blind Assassin."