Multiple Column Report

We are trying to create a multiple column report. The data looks like this:

Department PersonName
Department PersonName
Department PersonName
Department PersonName

So sample data would be:

Advertising Mary
Marketing Harry
Marketing Tim
Marketing Zoe
Sales Joe
Sales Sue
...

The report needs to look like this:

Advertising
Mary

Marketing
Harry Tim
Zoe

Sales
Joe Sue

So basically the header of the department needs to span 2 columns and the people need to be printed in 2 columns under that header.

This is a common layout for many of our reports (group header spans multiple columns of child data) - however we cannot figure out how to do this with reporting services. We were able to do this in other reporting tools, but are trying to move to reporting services.

Any idea on how to do this in reporting services?

The only idea I have seen, which is not acceptable is to modify the incoming data into something like:

Department Person1 Person2
Department Person1 Person2
Department Person1 Person2

This is especially bad because if the report format changes you now have to change the way the data is sent in.

Any ideas on how to accomplish this with the data coming in properly?