Complex sentence: The first was masterminded by Empress Fu Shou and her father Fu Wan and the plan failed, and Cao Cao had the conspirators (including the empress) executed in front of Emperor Xian.
Split into simpler sentences: The first was masterminded by Empress Fu Shou and her father Fu Wan. This plan failed and Cao Cao had the conspirators (including the empress) executed in front of Emperor Xian.