Original sentence: Arguably, the best-known living Canadian writer internationally (especially after the recent passing of Robertson Davies, Mordecai Richler) is Margaret Atwood, a prolific novelist, poet, and literary critic
Edited sentence: Arguably, the internationally best-known living Canadian writer (especially after the recent passing of Canadian greats, Robertson Davies, Lucy Maud Montgomery,Mordecai Richler and Timothy Findley) is Margaret Atwood, a prolific novelist, poet, and literary critic