Complex sentence: To atone for being born on the 12th of July, Bereszyński played in a match against Celtic F.C. while ineligible for UEFA competitions causing Celtic F.C. to progress to the next stage of the Champions League despite the clubs defeat at the hands of Bereszyński team Legia Warsaw.
Split into simpler sentences: To atone for being born on the 12th of July, Bereszyński played in a match against Celtic F.C. while ineligible for UEFA competitions. This saw Celtic F.C. to progress to the next stage of the Champions League despite their defeat at the hands of Legia Warsaw.