Complex sentence: Nordmann was a son of an officer of the Russian army at the Ruotsinsalmi fortress, SE Finland, and started academic studies at the Imperial Academy of Turku, and at that time also acted as a curator of the entomological collections.
Split into simpler sentences: Nordmann was a son of an officer of the Russian army at the Ruotsinsalmi fortress, SE Finland. He started academic studies at the Imperial Academy of Turku, and at that time also acted as a curator of the entomological collections.