Complex sentence: Cao Shuang's popularity and influence was dropped to a new low as his military defeat, while in the same time, Sima Yi's popularity and influence further increased for his opposition to the campaign from the start.
Split into simpler sentences: Cao Shuang's popularity and influence dropped to a new low after his defeat. At the same time, Sima Yi's popularity and influence further increased due to his opposition to the campaign from the start.