Complex sentence: Napoleon used the plot to justify the re-creation of a hereditary monarchy in France, with himself as emperor, as a Bourbon restoration would be more difficult if the Bonapartist succession was entrenched in the constitution.
Split into simpler sentences: Napoleon used the plot to justify the re-creation of a hereditary monarchy in France with himself as emperor. He believed a Bourbon restoration would be more difficult if the Bonapartist succession was entrenched in the constitution.