Complex sentence: Wiejowski spent a year in Kołaczyce where he lived secretly with family but at the end of 1941 he was again arested and imprisoned in Jasło where he was killed.
Split into simpler sentences: Wiejowski spent a year in Kołaczyce, where he lived secretly with family. But at the end of 1941 he was again arrested and imprisoned in Jasło, where he was killed.