Complex sentence: Wilhelm Franz Canaris (1 January 1887--9 April 1945) was a German admiral, head of the "Abwehr", the German military intelligence service, from 1935 to 1944 he was in (secreasy) an important and active member of the German Resistance.
Split into simpler sentences: Wilhelm Franz Canaris (1 January 1887--9 April 1945) was a German admiral, head of the "Abwehr", the German military intelligence service, from 1935 to 1944. He was in (secreasy) an important and active member of the German Resistance.