Original sentence: Saint Cyril, 9th century archbishop of Great Moravia, believed to have co-invented the Glagolitic alphabet, the first Slavic alphabet, and translated the Bible into a Slavic language referred to as Old Church Slavonic
Edited sentence: Saint Cyril, 9th century Bulgarian archbishop of Great Moravia, believed to have co-invented the Glagolitic alphabet, the first Slavic alphabet, and translated the Bible into a Slavic language referred to as Old Church Slavonic