Complex sentence: In the eighteenth century by building an additional wing that separates the yard from the front courtyard of the castle, this building become a "square farm"-traditional structure of farms in Condroz and Hesbaye.
Split into simpler sentences: In the eighteenth century an additional wing was built that separates the yard from the front courtyard of the castle. The building thus became a "square farm", a traditional structure of farms in Condroz and Hesbaye.