Complex sentence: On August 24,1813, the town was completely flooded by the Vistula, and in 1820, Pacanów had app.1,000 residents, half of whom were Jewish.
Split into simpler sentences: On August 24,1813, the town was completely flooded by the Vistula river. In 1820, Pacanów had circa 1,000 residents, half of whom were Jewish.