that was an awesome grammar breakdown, @aqwsed, thank you🙂
so again to sum up...
the text is clear that
when jesus died
god did some signs to make it clear jesus was his son
one of the signs was a really big earthquake
one of the signs was the temple curtain ripping in two
one of the signs was a bunch of faithful jews being resurrected in a manner similar to that with the elisha's bones resurrection thing
the army officer attending jesus' execution and some others witnessed it
and said "truly this was god's son"
later after the sabbath those resurrected ones entered the city
and other people saw them too, for a witness
and matthew wrote about it