Complex sentence: In 1803, the newly appointed commander of Russian forces in the Caucasus, Paul Tsitsianov, attacked Ganja and captured its citadel on 15 January 1804; the governor, Javad Khan Qajar, was killed, and a large number of the inhabitants slaughtered.
Split into simpler sentences: In 1803, the newly appointed commander of Russian forces in the Caucasus, Paul Tsitsianov, attacked Ganja and captured its citadel on 15 January 1804. Ganja's governor, Javad Khan Qajar, was killed, and a large number of the inhabitants slaughtered.