Original sentence: Joseph Stalin's desire for revenge against Franco was frustrated at the Potsdam Conference of 1945, when his attempt to make an Allied invasion of Spain the conference's first order of business was rejected by Harry Truman and Winston Churchill
Edited sentence: Joseph Stalin's understandable desire for revenge against Franco was frustrated at the Potsdam Conference of 1945, when his attempt to make an Allied invasion of Spain the conference's first order of business was rejected by Harry Truman and Winston Churchill