Complex sentence: Ieuan ap Hywel Swrdwal (? 1430 -? 1480) was a Welsh poet, responsible for the first known poem in the English language written by a Welshman.
Split into simpler sentences: Ieuan ap Hywel Swrdwal (? 1430 -? 1480) was a Welsh poet. He composed primarily in Welsh, but was also responsible for the first known poem in the English language written by a Welshman.