The pronunciation of 司马懿 (Sī Mǎ Yì) in Chinese is:

• 司 (Sī) is pronounced as "see" with a rising tone
• 马 (Mǎ) is pronounced as "mah" with a falling tone
• 懿 (Yì) is pronounced as "ee" with a falling tone

So, the full pronunciation of 司马懿 is "see mah ee" with a rising-falling-falling tone.