Complex sentence: In 1920, during the Civil War in Russia, Rostislav Ustinov with his family moved to Crimea, and enlisted into a cadet corps military school established by General Pyotr Wrangel.
Split into simpler sentences: In 1920, during the Civil War in Russia, Rostislav Ustinov moved with his family to Crimea. There he enlisted into a cadet corps military school established by General Pyotr Wrangel.