Complex sentence: The smallest tea house has two rooms: a tea room and a "mizuya", where the host prepares the sweets and equipment, and may have a total floor area of only two or three mats.
Split into simpler sentences: The smallest tea house has two rooms: a tea room and a "mizuya", where the host prepares the sweets and equipment. The tea room and may have a total floor area of only two or three mats.