Complex sentence: Euonymeia declined in medieval times together with Athens after Christian reforms brought on the Decline of Greco-Roman polytheism, and at some point during this time its name changed to the village of Trachones.
Split into simpler sentences: Euonymeia declined in medieval times together with Athens after Christian reforms brought on the Decline of Greco-Roman polytheism. At some point during this time the settlement's name changed to the village of Trachones.