insert a graph and change the chart type to Cluster Column.
Make sure the chart contains 4 sets of columns.
Select the 3rd set of columns and change them to the secondary axis.
Repeat for the 4th set of columns. You should now have dataseries 3 and
4 side by side and in front of 1 and 2.
Set the data values for series 2 and 3 to 0. This will then expose the
series 1 and 4 side by side. Format both y axis to suit.
You will also have to sort out the legend, as it contains 4 data series.
Select the legend, select the legend entry and then delete. Be sure not
to select the legend marker as deleting this will delete the data as well.