Complex sentence: The German offensive cost the Red Army an estimated 70,000 casualties but the house-to-house fighting in Kharkiv was also particularly bloody for the German SS Panzer Corps, which had lost approximately 4,300 men by the time operations ended in mid March.
Split into simpler sentences: The German offensive cost the Red Army an estimated 70,000 casualties. The house-to-house fighting in Kharkiv was also particularly bloody for the German SS Panzer Corps, which had lost approximately 4,300 men by the time operations ended in mid March.