Complex sentence: In the last issue of Silent War, the marines show up at Attilan and are beaten, a feint to allow one marine to explode within the confines of the city, destroying the lunar Attilan.
Split into simpler sentences: In the last issue of Silent War, the Marines again assail Attilan and are repulsed. In reality, this battle was a feint designed to allow one Marine to explode within the confines of the city, destroying lunar Attilan.