Complex sentence: Towards the end of war the Soviets were able to concentrate massive numbers of Shturmoviks to support their main offensives, but particularly against dug-in and armored targets the effect was often more psychological than actual physical destruction of targets.
Split into simpler sentences: Towards the end of war the Soviets were able to concentrate massive numbers of Shturmoviks to support their main offensives. However, particularly against dug-in and armored targets, the effect was often more psychological than actual physical destruction of targets.