Complex sentence: Helge Hjalmar Immanuel Strömbäck (26 July 1889--20 March 1960) was a Swedish Navy vice admiral who was the Chief of the Naval Staff from 1942 to 1945 and the Chief of the Navy from 1945 to 1953.
Split into simpler sentences: Helge Hjalmar Immanuel Strömbäck (26 July 1889--20 March 1960) was a Swedish Navy vice admiral. He was the Chief of the Naval Staff from 1942 to 1945 and the Chief of the Navy from 1945 to 1953.