Complex sentence: In 1965, Brownell chaired a committee to find civilians, who would serve on the first impartial Civilian Complaint Review Board of New York City, the first such citizen oversight of police in the country.
Split into simpler sentences: In 1965, Brownell chaired a committee to find civilians who would serve on the first impartial Civilian Complaint Review Board of New York City. It was the first such citizen oversight of police in the country.