Complex sentence: The Dukes of Brabant and Lower Lotharingia, also count of Leuven and Brussels, were their protectors and regarded it as a privilege to be buried in the abbey church.
Split into simpler sentences: The Dukes of Brabant and Lower Lotharingia, also count of Leuven and Brussels, were their protectors. They regarded it as a privilege to be buried in the abbey church.