Complex sentence: Mathias concludes that it would be hard to find anybody who has rendered greater service to the Welsh nation than William Salesbury, with his translation of the scriptures into Welsh laying the foundations of modern Welsh prose.
Split into simpler sentences: Mathias concludes that it would be hard to find anybody who has rendered greater service to the Welsh nation than William Salesbury. His translation of the scriptures into Welsh laid the foundations of modern Welsh prose.