Complex sentence: The family originated from the Cornwall (Southern Lebanon area) area of Pennsylvania, one of the oldest and smallest boroughs in the United States known for the rich coal mining empire of the Cornwall Iron Furnance, made famous by the Robert Coleman and Peter Grubb families.
Split into simpler sentences: The family originated from the Cornwall (Southern Lebanon area) area of Pennsylvania-one of the oldest and smallest boroughs in the United States. This geographic area which is historically known for the rich coal mining empire of the Cornwall Iron Furnance, made famous by the Robert Coleman and Peter Grubb families.