Complex sentence: On 31 March 1942, he claimed his 20th aerial victory, his 30th on 24 June 1942, and aerial victories 39 to 42 on 29 July 1942.
Split into simpler sentences: On 31 March 1942, he claimed his 20th aerial victory. He was credited with his 30th victory on 24 June 1942, and aerial victories 39 to 42 on 29 July 1942.