Complex sentence: Both Marcianopolis and Odessus (the Roman name of Odessos) were major early Christian centres; it is believed that Saint Andrew founded the local Christian church and his disciple Ampliatus served as bishop at Odessus.
Split into simpler sentences: Both Marcianopolis and Odessus (the Roman name of Odessos) were major early Christian centres. It is believed that Saint Andrew founded the local Christian church and his disciple Ampliatus served as bishop at Odessus.