Complex sentence: The catacombs beneath the facility, inspired by early twentieth-century brickwork and Victorian industry were meant to feel oppressive, the maximum security area was designed to feel claustrophobic and was retrofitted like a bunker, and the Arkham mansion displays a High Gothic style.
Split into simpler sentences: The catacombs beneath the facility, inspired by early twentieth-century brickwork and Victorian industry, were meant to feel oppressive. The maximum security area was designed to feel claustrophobic and was retrofitted like a bunker, and the Arkham mansion displays a High Gothic style.