Complex sentence: But he eventually left academia for a career in the military, the high point of which was Rath's appointment as the war commissioner (Kriegskommissar, the officer appointed to handle financial matters) under Prince Ludwig I of Anhalt-Köthen.
Split into simpler sentences: But he eventually left academia for a career in the military. The high point of which was Rath's appointment as the war commissioner (Kriegskommissar, the officer appointed to handle financial matters) under Prince Ludwig I of Anhalt-Köthen.