Complex sentence: Zhu Ling did not show any disappointment or anger about Cao Cao's treatment to him; on the contrary, he was known to be a fierce vassal and was listed among the best vassal in Cao Cao's army.
Split into simpler sentences: Zhu Ling did not show any disappointment or angry about Cao Cao's treatment to him. On the contrary, he was known to be a fierce vassal and was listed among the best vassal in Cao Cao's army.