Simplify the following text for a Grade 7 native English-speaking person.
Original: Generalleutnant Otto Liman von Sanders ( February 17 , 1855 - August 22 , 1929 ) was a German general who served as adviser and military commander for the Ottoman Empire during World War I.
Simplified: Otto Liman von Sanders ( 17 February 1855 - 22 August 1929 ) was a German general .