I am far from a bleach expert as I only watched the first couple of arcs, but my understanding is that the anime adaptation of Bleach ended since they had caught up with the source material and didn't want to keep making filler content while they waited for the manga. While the show was on hiatus, the manga continued with the final arc, called The Thousand Year Blood War. So, after the manga finished, they started the Bleach anime back up to adapt the end. That is what is currently airing.