Complex sentence: Toulon was under blockade at the time by the Royal Navy Mediterranean Fleet under Admiral William Hotham based at San Fiorenzo on Corsica, although the blockade was only loosely enforced and Hotham was not even aware that Richery had sailed until 22 September.
Split into simpler sentences: Toulon was under blockade at the time by the Royal Navy Mediterranean Fleet under Admiral William Hotham based at San Fiorenzo on Corsica. The blockade was only loosely enforced, and Hotham was not even away that Richery had sailed until 22 September.