A high-level reshuffling at Citigroup Inc. has underscored yet again the difficulty of forging a single enterprise out of investment banking and commercial lending, observers of the company said Monday.

Co-chairmen and chief executive officers Sanford I. Weill and John S. Reed announced the changes late Sunday. They were forced to act, by all accounts, because the two sides were unable to create the coherent corporate financial services business envisioned in the merger.

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