Complex sentence: John of Fordun (14th century) finally recorded the better known account of the event, that Duncan II was "slain at Monthechin by the Earl of Mernys... through the wiles of his uncle Donald".
Split into simpler sentences: John of Fordun (14th century) finally recorded the better known account of the event. That Duncan II was "slain at Monthechin by the Earl of Mernys... through the wiles of his uncle Donald".