Complex sentence: Major Armbruster suggests a test that would show whether Reisman's men are readyduring practice maneuvers in which Breed will be taking part, the "Dirty Dozen" will attempt to capture the Colonel's headquarters.
Split into simpler sentences: Major Armbruster suggests a test that would show whether Reisman's men are ready. During practice maneuvers in which Breed will be taking part, the "Dirty Dozen" will attempt to capture the Colonel's headquarters.