Complex sentence: AQH is an abbreviation for Average Quarter-Hour Persons (AQH Persons), defined by Arbitron as the average number of persons listening to a particular station for at least five minutes during a 15-minute period.
Split into simpler sentences: AQH is an abbrieviation for Average Quarter-Hour Persons (AQH Persons). This is the average number of persons listening to a particular station for at least five minutes during a 15-minute period.