Complex sentence: The middle class residents of Broomfields were distinguished and well known but very few in number-never more than about 60 in a population of up to 8,000-only 0.8% of the total.
Split into simpler sentences: The middle class residents of Broomfields were distinguished and well known but very few in number. They were never more than about 60 in a population of up to 8,000, only 0.8% of the total.