Complex sentence: Prior to the independence of Belgium, Béatrix de Cusance hosted a salon in Brussels in then Spanish Netherlands in the mid 17th-century, and in the late 18th-century, the political salon of Anne d'Yves played a role in the Brabant Revolution of 1789.
Split into simpler sentences: Prior to the formation of Belgium, Béatrix de Cusance hosted a salon in Brussels in what was then the Spanish Netherlands in the mid 17th-century. In the late 18th-century, the political salon of Anne d'Yves played a role in the Brabant Revolution of 1789.