I am thinking of doing a partial split between investment providers (custodians)
of a Beneficiary IRA (inherited) which has been properly titled and in place
(including RMDs) for a few years.

Would there be any complications or IRS confusion if I then withdraw the full RMD for
the combined value from only one of the now split accounts? Even tho the Social Security
number is of course the same, I’m not sure how the IRS would be made aware that
the RMD has in fact been taken other than if I provide a statement with my tax return
(which in itself would require manual review of my return)?

Thanks for your help