Complex sentence: Kurt Graunke founded the ensemble as the "Graunke Symphony Orchestra" in 1945 and led its first concert on September 25 of that year as a benefit for the Bavarian Red Cross.
Split into simpler sentences: Kurt Graunke founded the orchestra as the "Graunke Symphony Orchestra" in 1945. The ensemble gave its first concert on 25 September 1945, as a benefit for the Bavarian Red Cross.