Complex sentence: It was led by prominent members of the clergy and other notables inlcuding Taliesin Williams with the purpose of collecting, studying, and publishing manuscripts referencing the ancient poetry, prose and historiography of Britain and Wales.
Split into simpler sentences: It was led by prominent members of the clergy and other notables inlcuding Taliesin Williams. It had the purpose of collecting, studying, and publishing manuscripts referencing the ancient poetry, prose and historiography of Britain and Wales.