Complex sentence: The Hidden Lake Realty Company, Inc. advertised that all the lots were 50 X 100 feet or larger and that with a $20 down payment and $5 per month you could purchase a "Cottage Site" within 300 feet of the shore.
Split into simpler sentences: The Hidden Lake Realty Company, Inc. advertised that all the lots were 50 X 100 feet or larger. With a $20 down payment and $5 per month, an individualcould purchase a "Cottage Site" within 300 feet of the shore.