Complex sentence: As a campaign manager in an election occurring in the shadow of the September 11 attacks, he surveyed potential voters'perceptions of the propriety of the campaign's advertising broadcasts because at the time certain ads were thought to focus on sensitive topics.
Split into simpler sentences: As a campaign manager in an election occurring in the shadow of the September 11 attacks, he surveyed potential voters'perceptions of the propriety of the campaign's advertising broadcasts. At the time certain ads were thought to focus on sensitive topics.