Cytat: Janski
Jaki jest powód użycia "a" dla pierwszego boksera...oraz z czego wynika brak "a" dla drugiego?
On December 23, 2023, a 41-year-old boxer, De Mori, challenged Filip Hrgović, a 31-year-old Croatian (boxer), to a ten-round bout.
You misquoted the original sentence. Funnily enough, I'm not sure if that even affects your confused answer.
Cytat: Janski
No matter what one can create out of “the old Poland,” “the new(ly) (created) Poland” will be in fact the same and indivisible.
It's not about whether or not Poland is divisible. It's about whether there can be
many versions of Poland. And yes, there can. There can be a new Poland, a technologically-advanced Poland, a nationalist Poland (God forbid) etc. Similarly, we can move towards a more sustainable future, elect a President who respects the Constitution etc.