Complex sentence: Mingled with retreating Wehrmacht units these refugees were attacked by Soviet bombers and fighter aircraft, without any camouflage or shelter many wagons broke through the bomb-riddled ice covering the brackish water.
Split into simpler sentences: Mingled with retreating Wehrmacht units, and without any camouflage or shelter, the refugees were attacked by Soviet bombers and fighter aircraft. Many wagons broke through the bomb-riddled ice covering the brackish water.