Complex sentence: He was arrested by the Germans on March 23,1943 and rescued by the Grupy Szturmowe of the Szare Szeregi three days later during the so-called Arsenal action on March 26, he died on March 30 of injuries sustained during interrogations by the Gestapo.
Split into simpler sentences: He was arrested by the Germans on March 23,1943 and rescued by the Grupy Szturmowe of the Szare Szeregi three days later during the so-called Arsenal action on March 26. He died on March 30 of injuries sustained during interrogations by the Gestapo.