In PowerPoint, there is no standard option to create a combined stacked and clustered column chart. Here is a work around, taking the stacked column chart as the basis.
- Set the gap width to zero (in the format data series menu) to create the white breaks in between the columns
- Adjust the data points manually. The first stacked column goes in regularly. The second stacked column (that should have a different color scheme) gets added on top of the first one. But for data points of the second column, you zero out the values of the first one. Sounds a bit complicated, but the visual example below should make it clear.