Complex sentence: By August 4, a perimeter was established around Pusan, on the hills to the north of the city and the Naktong River to the west, with the Eighth Army, including the 24th Infantry Division cornered by the surrounding North Korean army.
Split into simpler sentences: By August 4, a perimeter was established around Pusan on the hills to the north of the city and the Naktong River to the west. The Eighth Army, including the 24th Infantry Division, was cornered by the surrounding North Korean army.