Complex sentence: It had four rooms on the ground floor and four rooms on the second level, each having a fireplace and chimney, and large central hallways opened in warm weather from front to back to form a breezeway.
Split into simpler sentences: It had four rooms on the ground floor and four rooms on the second level, each having a fireplace and chimney. The large central hallways opened in warm weather from front to back to form a breezeway.