Complex sentence: The plural form "gelloudes", not found in Ancient Greek, came into existence in the Byzantine period, and used by the 8th century by the patriarch John of Damascus, in his treatise "Peri strygnōn" ("Regarding " striges"").
Split into simpler sentences: The plural form "gelloudes", not found in Ancient Greek, came into existence in the Byzantine period. The "gelloudes" were referred to by the 8th century by the patriarch John of Damascus, in his treatise "Peri strygnōn" ("Regarding " striges"").