Complex sentence: He was afterwards appointed Commander of the National Guard in the Franche-Comté; the friendship with Talleyrand worth him his appointment to command a special guard, where there were the most disciplined soldiers of the National Guard of Paris.
Split into simpler sentences: He was afterwards appointed Commander of the National Guard in Franche-Comté. His friendship with Talleyrand brought him an appointment to command a special guard, comprised of the most disciplined soldiers of the National Guard of Paris.