Complex sentence: At the time of the attack on Plei Me, about 300 Montagnards, the 14 Vietnamese, and 10 Americans were inside the camp, the others were on patrol or stationed at nearby listening posts.
Split into simpler sentences: AT the time of the attack on Plei Me, about 300 Montagnards, the 14 Vietnamese, and 10 Americans were inside the camp. The others were on patrol or stationed at nearby listening posts.