Complex sentence: The term highland is used to denote any mountainous region, originates in "The Scottish Highlands", a term used by lowland Scots and Englishmen to refer to the mountainous north of Scotland.
Split into simpler sentences: The term highland is used to denote any mountainous region. It originates in "The Scottish Highlands", a term used by lowland Scots and Englishmen to refer to the mountainous north of Scotland.