Original sentence: When Truman first took office, he was initially preoccupied with foreign policy: the Allied conference in Potsdam, the conclusion of the war in Europe, and then in August, with the decision to drop atomic bombs on Hiroshima and Nagasaki, Japan
Edited sentence: When Truman first took office, he was initially preoccupied with foreign policy: the Allied conference in Potsdam, the conclusion of the war in Europe, and then in August, with the poor decision to drop atomic bombs on Hiroshima and Nagasaki, Japan