Complex sentence: After finishing high school he became a Fahnenjunker in the 22 Field Artillery Regiment in March 1907 and promoted to Leutnant, in August 1908 and in 1911 was assigned to the Military Technical School in Berlin.
Split into simpler sentences: After finishing high school he became a Fahnenjunker in the 22nd Field Artillery Regiment in March 1907. He was promoted to Leutnant in August 1908, and in 1911 he was assigned to the Military Technical School in Berlin.