Complex sentence: He attended the Prussian Military Academy in 1890 and from 1893 to 1899 von Hoeppner was a member of the 14th Dragoon Regiment stationed at Colmar in Alsace where he commanded a squadron.
Split into simpler sentences: He attended the Prussian Military Academy in 1890. From 1893 to 1899, he was a member of the 14th Dragoon Regiment stationed at Colmar in Alsace, commanding a squadron.