Complex sentence: Santi Nereo e Achilleo is a fourth-century basilica church in Rome, located in via delle Termi di Caracalla in the rione Celio, facing the main entrance to the Baths of Caracalla.
Split into simpler sentences: Santi Nereo e Achilleo is a 4th century basilica church in Rome. The church is located in the rione Celio, close to the Baths of Caracalla.