Complex sentence: The Franco Dutch War continued until 1678; three English regiments were added to the existing Scottish ones and it was renamed the Anglo-Scots Brigade with Mackay appointed Colonel of one of the Scots regiments in 1680.
Split into simpler sentences: The Franco Dutch War continued until 1678; three English regiments were added to the existing Scottish ones and the Brigade became the Anglo-Scots Brigade. Mackay was appointed Colonel of one of the Scots regiments in 1680.