Original sentence: In his memoirs, Kesselring claims that many of these shootings were carried out by communist partisans in German uniforms, while others were carried out by the SS, over which he claims he had no authority
Edited sentence: In his memoirs Kesselring claims that many of these shootings were carried out by communist partisans in German uniforms, while others were carried out by the SS, over which he claims he had no authority (none of these opinions is confirmed in any way)