Complex sentence: Quigley became very trusted by Reagan's people for her accuracy and she set the time, with detailed reasoning, of Reagan's successful debate with Carter in October, which is credited by some with affecting the outcome of the election a week later.
Split into simpler sentences: Quigley became very trusted by Reagan's people for her accuracy. She claims to have set the time, with detailed reasoning, of Reagan's successful debate with Carter in October, which is credited by some with affecting the outcome of the election a week later.