Complex sentence: Upon graduation from Princeton, Goldman had a three year stint in the U.S. Army stationed on Enewetak, an atoll in the Marshall Islands of the central Pacific Ocean, the Army activity there concerning the examination of the explosion clouds of nuclear bombs.
Split into simpler sentences: Upon graduation from Princeton, Goldman had a three year stint in the U.S. Army stationed on Enewetak, an atoll in the Marshall Islands of the central Pacific Ocean. The Army activity there concerning the examination of the explosion clouds of nuclear bombs.