Complex sentence: Until the late Middle Ages the Western Church used the Latin Vulgate almost entirely while the Eastern Church centered in Constantinople mostly used the Greek Byzantine text, but from the 14th century there were increasing numbers of vernacular translations into various languages.
Split into simpler sentences: Until the late Middle Ages, the Western Church used the Latin Vulgate almost entirely while the Eastern Church, centered in Constantinople, mostly used the Greek Byzantine text. Beginning with the 14th century, there have been increasing numbers of vernacular translations into various languages.