Complex sentence: On 22 April, Hitler relieved Reymann of his command for his defeatism, and replaced him with newly promoted Major General Ernst Käther, the former Chief of Staff to the Chief Wehrmacht political commissar.
Split into simpler sentences: On 22 April, Hitler relieved Reymann of his command for his defeatism and replaced him with newly promoted Major General Ernst Käther. Kather was the former Chief of Staff to the Chief Wehrmacht political commissar.