Aye, it's been split since time immemorial, as far as the people of Hydaelyn are concerned. Every nation, every culture that has ever existed came into being after the Sundering.

[It's a strange thing to discuss, because he can't really comprehend it himself.]

There have been seven great Calamities, and with each Calamity a shard was rejoined with the Source— killing everyone on those shards in the process. "Shard" might not even be the correct term, because that makes it sound like they're not entire stars worth of people being murdered. The death toll is in the tens of billions at the very least.

The First very nearly fell, but its fall was able to be prevented with the death of the two left who were responsible for the Calamities in the first place. With them dead, the remaining shards will likely go on, oblivious of their status as "reflection".

[As for the gods, well, he definitely agrees. But Garleans seem to be the odd ones out when it comes to these things.]

Though, I suppose if you mean to ask if it's affected the star's shape, in which case, I don't believe so? It's quite round; any sailor could tell you that much.