Complex sentence: At times the two families caused considerable disturbance to the King's peace as their retainers pitched battles in the locality however the feud finally was ended when William Guthrie of Guthrie killed Patrick Gardyne 9th Gardyne of that Ilk and his brother as they crossed Inverpeffer Moor.
Split into simpler sentences: At times the two families caused considerable disturbance to the King's peace as their retainers fought pitched battles in the locality. The feud was finally brought to an end when William Guthrie of Guthrie killed Patrick Gardyne 9th Gardyne of that Ilk and his brother as they crossed Inverpeffer Moor.