Complex sentence: Together with the Dogmatic sarcophagus in the same museum, it is one of the oldest surviving high-status sarcophagi with elaborate carvings of Christian themes, carved in relief on three sides for placement against a wall.
Split into simpler sentences: Together with the Dogmatic sarcophagus in the same museum, it is one of the oldest surviving high-status sarcophagi with elaborate carvings of Christian themes. These are carved in high relief on three sides for placement against a wall.