Simplify the following text for a Grade 8 native English-speaking person.
Original: When Japan continued to ignore the Potsdam terms , the United States dropped atomic bombs on the Japanese cities of Hiroshima and Nagasaki in early August .
Simplified: The Allies wanted Japan to surrender with no terms , but Japan refused . The United States then dropped two atomic bombs over Hiroshima ( August 6 ) and Nagasaki ( August 9 ) .