Complex sentence: The earliest surviving Christian art comes from the late 2nd to early 4th centuries on the walls of Christian tombs in the catacombs of Rome, although from literary evidence there may well have been panel icons which, like almost all classical painting, have disappeared.
Split into simpler sentences: The earliest surviving Christian art comes from the late 2nd to early 4th centuries on the walls of Christian tombs in the catacombs of Rome. From literary evidence, there may well have been panel icons which, like almost all classical painting, have disappeared.