Complex sentence: She also gradually elevated the statuses of not only herself but also her Wu clan members, both past and present, which led members of the imperial Li clan to suspect that she planned slaughter them, overthrow the Tang Dynasty, and replace it with her own.
Split into simpler sentences: She also gradually elevated the statuses of not only herself but also her Wu clan members, both past and present. This led members of the imperial Li clan to suspect that she planned slaughter them, overthrow the Tang Dynasty, and replace it with her own.