Complex sentence: Although it was a stunning victory for the Jacobites, it had little overall effect on the outcome of the war and with their leader dead, their forces were scattered at the Battle of Dunkeld the next month.
Split into simpler sentences: Although it was a stunning victory for the Jacobites, it had little overall effect on the outcome of the war and left their leader dead. Their forces were scattered at the Battle of Dunkeld the next month.