Original sentence: Old Church Slavonic, also known as Old Bulgarian, or Old Macedonian, was the first literary Slavic language, based on the old Solun dialect of the Thessalonica region by the 9th century Byzantine Greek missionaries, Saints Cyril and Methodius, who used it for translation of the Bible and other Ancient Greek ecclesiastical texts, and for some of their own writings
Edited sentence: Old Church Slavonic, also known as Old Bulgarian, or Old Macedonian, was the first literary Slavic language, based on the old Solun dialect of the Thessalonica region by the 9th century Byzantine missionaries, Saints Cyril and Methodius, who used it for translation of the Bible and other Ancient Greek ecclesiastical texts, and for some of their own writings