Complex sentence: The future lexicographer was born in the town of Lugansky Zavod (now Luhansk, Ukraine) and served in the Russian Navy from 1814 to 1826, graduating from the St. Petersburg Naval Cadet School in 1819.
Split into simpler sentences: The future lexicographer was born in the town of Lugansky Zavod (now Luhansk, Ukraine). Dahl served in the Russian Navy from 1814 to 1826, graduating from the St. Petersburg Naval Cadet School in 1819.