Complex sentence: Although peace was made with France in 1796, by 1798 conflict again erupted and the royal family fled to the Kingdom of Sicily, leaving Naples on 21 December 1798 aboard the, a British Royal Navy vessel protected by two Neapolitan warships.
Split into simpler sentences: Although peace was made with France in 1796, by 1798 conflict was again fierce. The family left Naples on 21 December 1798 aboard the, a British Royal Navy vessel that was in turn protected by two Neapolitan warships.