Complex sentence: He was a member of the group of German officers who assisted in the direction of the Ottoman Army during World War I. Kress von Kressenstein was part of Otto Liman von Sanders military mission to Turkey, which arrived in Turkey shortly before World War I broke out.
Split into simpler sentences: He was a member of the group of German officers who assisted in the direction of the Ottoman Army during World War I. Kreß von Kressenstein was part of Otto Liman von Sanders military mission to Turkey. This German mission arrived in Turkey shortly before World War I broke out.