Complex sentence: "Flat Earthism" lingered longest in Syriac Christianity, which tradition laid greater importance on a literalist interpretation of the Old Testament, and authors from that tradition such as Cosmas Indicopleustes presented the Earth as flat as late as in the 6th century.
Split into simpler sentences: Flat Earthism lingered longest in Syriac Christianity, which tradition laid greater importance on a literalist interpretation of the Old Testament. Authors from that tradition, such as Cosmas Indicopleustes, presented the Earth as flat as late as in the 6th century.