Complex sentence: This achievement earned Hartenstein a reference on 6 June 1942 in the "Wehrmachtbericht" (armed forces report), an information bulletin issued by the headquarters of the Wehrmacht.
Split into simpler sentences: This achievement earned Hartenstein a reference in the "Wehrmachtbericht" (armed forces report) on 6 June 1942. The "Wehrmachtbericht" was an information bulletin issued by the headquarters of the Wehrmacht.