Complex sentence: Lufthansa traces its history to 1926 when Deutsche Luft Hansa A.G. (from 1933 styled as "Deutsche Lufthansa") was formed in Berlin, an airline that was Germany's flag carrier until 1945 when all services were suspended following the defeat of Germany.
Split into simpler sentences: Lufthansa traces its history to 1926 when Deutsche Luft Hansa A.G. (from 1933 styled as "Deutsche Lufthansa") was formed in Berlin. DLH, as it was known for short, was Germany's flag carrier until 1945 when all services were suspended following the defeat of Germany.