Complex sentence: On 13 January 1880, he was promoted 1st lieutenant, and during 1884 he studied at the Freiberg, Saxony, school of mines, and at the agricultural experiment station at Wiesbaden.
Split into simpler sentences: On 13 January 1880, he was promoted 1st lieutenant. During 1884, he studied at the Freiberg, Saxony, school of mines, and at the agricultural experiment station at Wiesbaden.