Complex sentence: After Crais was taken and returned by Maldis, Teeg informed him that she had prevented another officer from removing him from command and that she was still the only other person besides Crais who knew about the admiral's order.
Split into simpler sentences: After Crais was abducted and returned by Maldis, Teeg informed him of an attempt by another officer to remove him from command, an action that she had prevented. She also notified him that she was still the only other person besides Crais who knew about the admiral's order.