Complex sentence: He left only an infant daughter, Gwenllian of Wales, and leadership of the Welsh fell on Dafydd, who led a guerrilla resistance for some months but was soon betrayed, captured and executed as a traitor.
Split into simpler sentences: He left only an infant daughter, Gwenllian of Wales. Leadership of the Welsh fell to Dafydd, who led a guerrilla resistance for some months but was soon betrayed, captured and executed as a traitor.