Complex sentence: Sima Zhi did not inform Cao Rui about the Grand Empress Dowager's interference in the case, and instead instructed the officials in charge of the case to continue performing their duties accordingly.
Split into simpler sentences: Sima Zhi did not inform Cao Rui about the Grand Empress Dowager's interference in the case. Instead, he instructed the officials in charge of the case to continue performing their duties accordingly.