Complex sentence: In the season premiere of season 3, Ashley has been fired by Conrad, who knew of her involvement with Jack's failed revenge plane, and tries to blackmail Emily into helping her stay in the Hamptons by introducing her to rich men.
Split into simpler sentences: In the season 3 premiere 3, Ashley has been fired by Conrad, who knew of her involvement with Jack's failed revenge plane. Ashley tries to blackmail Emily into helping her stay in the Hamptons by introducing her to rich men.