Complex sentence: Maria Theresa of Austria had defended her claim to the Habsburg throne and had her husband, Francis Stephen, crowned Emperor in 1741, but she had been forced to relinquish valuable territory in the process.
Split into simpler sentences: Maria Theresa of Austria had defended her claim to the Habsburg throne and had her husband, Francis Stephen, crowned Emperor in 1741. However, she had been forced to relinquish valuable territory in the process.