Complex sentence: Sacromonte Abbey in Granada was founded in 1600 on the hill of Valparaiso outside the old city, and is built over catacombs (originally mine workings of Roman date).
Split into simpler sentences: Sacromonte Abbey in Granada was founded in 1600. The church is on the hill of Valparaiso outside the old city and is built over catacombs (originally mine workings of Roman date).