Complex sentence: From 28 December 986, the Bishop of Gap had sovereignty over the city due to concerns about future Muslim invasions, and held that power until Revolutionary reforms in 1801 despite Gap being annexed by the French crown in 1512.
Split into simpler sentences: From 28 December 986, the Bishop of Gap had sovereign rights over the the city due to concerns about future Muslim invasions. The bishops kept this power until Revolutionary reforms in 1801 despite Gap being annexed by the French crown in 1512.