Complex sentence: At court, Louise-Françoise's husband was known by the courtesy title of "duc de Bourbon", and was addressed as "Monsieur le Duc", and his wife as "Madame la Duchesse".
Split into simpler sentences: At court, Louise-Françoise's husband was known by the courtesy title of "duc de Bourbon". For this reason, he was addressed at court as "Monsieur le Duc", and his wife as "Madame la Duchesse".