Complex sentence: Sychyovka Offensive Operation which was defined as spanning from the 30 July to the 23 August 1942, but it is widely documented that the fighting continued undiminished into September and did not finally cease until the beginning of October 1942.
Split into simpler sentences: Sychyovka Offensive Operation which was defined as spanning from the 30 July to the 23 August 1942. But it is widley documented that the fighting continued undiminished into September and did not finnally cease until the beginning of October 1942.