Complex sentence: Cardiac Output (CO) is the product of stroke volume and heart rate, although CO is available beat by beat, it is usually averaged over a number of beats (typically 5) to reduce the variation in displayed value.
Split into simpler sentences: Cardiac output (CO) is the product of stroke volume and heart rate. Although CO is available beat by beat, it is usually averaged over a number of beats (typically 5) to reduce the variation in displayed value.