Operational roles of Ivy Bridge College are split along instructional and administrative lines.

Typically, within a larger organization, these roles are split into multiple roles or functions across various divisions and are not actioned by the one individual.

His former role was split as was the CBI Theater:

In several cases, roles have been arbitrarily split in two.

Those roles were split until September 2000, when Peter Salsbury, then chief executive, resigned.

Later the institution's two roles were split, and in time the school became King Edward's School, Witley.

The position was created after 1957, when the role of mayor (which was the previous head) was split into two new positions.

Zahn's early roles were split between movies, touring companies of Broadway shows, and TV shows.

In 1981 these roles were split and the parenting duty became the charge of 815 Naval Air Squadron.

It seems to me that that's a good indication for why the role of chairman and C.E.O. should be split.