Complex sentence: In the defense of Khorramshahr, the Iranians prepared a series of dykes on the outskirts of the city, the first dyke holding regular soldiers and the second dyke holding tanks, artillery, and anti-tank weapons.
Split into simpler sentences: In the defense of Khorramshahr, the Iranians prepared a series of dikes on the city outskirts. The first dike held regular soldiers and the second dike held tanks, artillery, and anti-tank weapons.