Complex sentence: In 1156, Somerled participated in a coup d'état against Godred, and the "Chronicle of Mann" relates that, Thorfinn Ottarsson, one of the leading men of the Isles, produced Dugald as a replacement to Godred's rule.
Split into simpler sentences: In 1156, Somerled participated in a coup d'état against Godred. The "Chronicle of Mann" relates that, Thorfinn Ottarsson, one of the leading men of the Isles, produced Dugald as a replacement to Godred's rule.