Complex sentence: The schoolhouse was both a school and a dwelling for the teacher, with one classroom, kitchen and living room on the ground floor, two bedrooms and a large attic upstairs and a full basement downstairs.
Split into simpler sentences: The schoolhouse was both a school and a dwelling for the teacher. It consisted of one classroom, kitchen and living room on the ground floor, two bedrooms and a large attic upstairs and a full basement downstairs.