Complex sentence: Soldiers in the Napoleonic wars used muskets, which do little damage over long distances and take a lot to reload, and this is incorporated into the gameplay as it takes a long time for a company to reload before it can produce another volley.
Split into simpler sentences: Soldiers in the Napoleonic wars carried muskets, which did little damage over long distances and took a lot of time to reload. This is reflected in the game, as it takes a long time for a company to reload before it can produce another volley.