Complex sentence: Lady Xiahou Hui was (poisoned during 234) many thought she was poisioned by her husband which raised accusations towards Sima Shi, during their marriage Xiahou Hui bore five daughters with Sima Shi.
Split into simpler sentences: Lady Xiahou Hui was (poisoned during 234) her husband was supposedly presumed as the person who poisioned Lady Xiahou Hui. Many pointed accusations towards Sima Shi, during their marriage Xiahou Hui bore five daughters with Sima Shi.