Complex sentence: On May 9,1920, the Polish army of General Rydz-Śmigły celebrated their capture of Kiev by a ceremonial parade on Khreschatyk, only to be driven out by the Bolshevik counter-offensive within weeks.
Split into simpler sentences: On May 9,1920, the Polish army of General Rydz-Śmigły celebrated their capture of Kiev by a ceremonial parade on Khreschatyk. It was, however, driven out by the Bolshevik counter-offensive within weeks.