The only data I've seen about it suggests they have always been able to split them.
The post i was able to find on ZAM from Feb 2002 claims that Aary had been upgraded and his guards were no longer splitable.
Then there are 2 follow up posts dated June and Nov saying that you can still split them.
Upgraded
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Feb 23 2002 at 8:56 AM Rating: Default
Dernalin
3 posts
AAs been upgraded. Guards are unsplitable now so you have to split tank AA and the guards. AAs hps have also been knocked up. Not an easy fight.
Dernalin Shadowflow
60 Assassin Torvo
SC
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RE: Upgraded
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Jun 28 2002 at 4:45 AM Rating: Decent
Opianna
5 posts
They are splitable.
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RE: Upgraded
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Nov 06 2002 at 11:32 PM Rating: Default
Plingeling
39 posts
As of Nov 7 still splittable (with lvl 60 monk at least)
http://everquest.allakhazam.com/db/n...7&p=1#comments