Complex sentence: On 11 August 1942 he made contact and fired four torpedoes at the aircraft carrier HMS "Eagle" sinking her in the engagement earning him the Knight's Cross of the Iron Cross on 12 August 1942 and a further reference in the "Wehrmachtbericht".
Split into simpler sentences: On 11 August 1942 he made contact and fired four torpedoes at the aircraft carrier HMS "Eagle" sinking her in the engagement. This achievement earned him the Knight's Cross of the Iron Cross on 12 August 1942 and a further reference in the "Wehrmachtbericht".