Complex sentence: As late as 1971, a U.S. Supreme Court hearing was held (Palmer v. Thompson) in which one of the Mayor's offenses included closing all city swimming pools after the District's Court granted a declaratory judgement entitling blacks use of the pools.
Split into simpler sentences: As late as 1971, a U.S. Supreme Court hearing was held (Palmer v. Thompson). One of the Mayor's offenses included closing all city swimming pools after the District's Court granted a judgement entitling blacks use of the pools.