Complex sentence: Estate houses in Scotland, also known as Scottish country houses, are large houses usually built on landed estates in Scotland, from the sixteenth century, after defensive Scottish castles began to be replaced by more comfortable residences built for royalty, nobility and local lairds.
Split into simpler sentences: Estate houses in Scotland, also known as Scottish country houses, are large houses usually built on landed estates in Scotland. They were built from the sixteenth century, after defensive Scottish castles began to be replaced by more comfortable residences built for royalty, nobility and local lairds.