Complex sentence: As a consequence for assisting Zangi, the Abbasid authorities put Ayyub to task; simultaneously, in another incident, Shirkuh killed a close confidant of Bihruz on charges that he had sexually assaulted a woman in Tikrit.
Split into simpler sentences: As a consequence for assisting Zangi, the Abbasid authorities sought punitive measures against Ayyub. Simultaneously, in a separate incident, Shirkuh killed a close confidant of Bihruz on charges that he had sexually assaulted a woman in Tikrit.