Complex sentence: In the Imperial Russia, General-Adjutant (Russian: Генерал-адьютант) was a title of a Court officer usually held by a military General, who served as a personal aide to the Russian Emperor and hence was a member of the Svita.
Split into simpler sentences: In the Imperial Russia, the General-Adjutant (Russian: Генерал-адьютант) was a Court officer, who was usually an army General. He served as a personal aide to the Tsar and hence was a member of the Svita.