Complex sentence: Pilecki came from a minor Polish noble family originally from the Grodno-area that had been forcibly resettled by Imperial Russian authorities decades earlier after the suppression of Poland's January Uprising of 1863--64.
Split into simpler sentences: Pilecki came from a minor Polish noble family originally from the Grodno-area. The family had been forcibly resettled by Imperial Russian authorities decades earlier after the suppression of Poland's January Uprising of 1863--64.