Complex sentence: The building consists of five floors including the basement, which has several tunnels leading to various places around downtown Nashville; however, they are currently boarded off and inaccessible, except during Ghost Tours held every October by the school's Student Government Association.
Split into simpler sentences: The building consists of five floors including a basement, which has several tunnels leading to various places around downtown Nashville. However, they are currently boarded off and inaccessible, except during Ghost Tours held every October by the school's Student Government Association.