Complex sentence: The two villages were cordoned at dawn on 28 August, and over the next six days the settlements were searched, during which a large quantity of assorted weapons including heavy machine guns and mortars were found.
Split into simpler sentences: The two villages were cordoned at dawn on 28 August. Over the next six days the settlements were searched, during which a large quantity of assorted weapons, including heavy machine guns and mortars, were found.