Complex sentence: In May 1865, Alim Quli lost his life while defending Tashkent against the Russians; many of his soldiers (primarily, of Kyrgyz and Kipchak background) deemed it advisable to flee for comparative safety of Kashgaria.
Split into simpler sentences: In May 1865, Alim Quli lost his life while defending Tashkent against the Russians. Many of his soldiers (primarily, of Kyrgyz and Kipchak background) deemed it advisable to flee to the comparative safety of Kashgaria.