Complex sentence: She then ruthlessly teased Madison about her relationship with Sheriff Lamb in front of their classmates through innuendo that, while her classmates didn't understand, had a meaning that was quite apparent to Madison, who was visibly shaken as a result.
Split into simpler sentences: She then ruthlessly teased Madison about her relationship with Sheriff Lamb in front of their classmates through innuendo that while her classmates didn't understand. However, the meaning was quite apparent to Madison, who was visibly shaken as a result.