Complex sentence: The North and South Doors are often called "Deacons' Doors" because the deacons use them frequently; often, icons of sainted deacons are depicted on these doors (particularly St. Stephen Protomartyr and St. Ephrem the Syrian).
Split into simpler sentences: The North and South Doors are often called "Deacons' Doors" because the deacons use them frequently. Icons of sainted deacons are often depicted on these doors (particularly St. Stephen the Protomartyr and St. Ephrem the Syrian).