Complex sentence: While he realizes Kei and Yuri's usefulness, he is irritated by all the damage they cause and if the 3WA's central mainframe would allow him to post them to permanent desk jobs, he would.
Split into simpler sentences: While he realizes Kei and Yuri's usefulness, he is irritated by all the damage they cause. If the 3WA's central mainframe would allow him to post them to permanent desk jobs, he would.