Complex sentence: The German Supreme Command of the Armed Forces ("Oberkommando der Wehrmacht", or OKW) intended to hold Sevastopol as a fortress, much as the Red Army had done during the first battle for the Crimea from 1941 to 1942.
Split into simpler sentences: The German Supreme Command of the Armed Forces ("Oberkommando der Wehrmacht", or OKW) intended to hold Sevastopol as a fortress. Much as the Red Army had done during the first battle for the Crimea from 1941 to 1942.