Complex sentence: During Byzantine times, Elyros was the seat of an Archbishop and the remains of the bishopric church, a 6th-century basilica, can still be seen in the centre of the old city.
Split into simpler sentences: During Byzantine times, Elyros was the seat of an Archbishop. The remains of the bishopric church, a 6th-century basilica, can still be seen in the centre of the old city.