Complex sentence: These were aided by royalist armies within France itself, such as the Chouans, and by allied countries such as Great Britain, and fought (for example) at the sieges of Lyon and Toulon.
Split into simpler sentences: These were aided by royalist armies within France itself, such as the Chouans, and by allied countries such as Great Britain. They fought, for example, at the sieges of Lyon and Toulon.