Hi @plaralema ,
You need to unpivot columns first, then spilit an attribute column by space, and then pivot again.
1.Select the four columns and click "Unpivot Columns".
2.Split by space.
3.Select the Attribute.1 column and then click "Pivot Column".
4.Set up as follows and click OK.
Final result is as follows. It's displayed as a matrix visual.
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.