I am currently able to create and expose a view that combines the results of multiple Flatten operations. When dealing with multiple arrays of data, I do need to perform Flatten on each of the arrays individually, as described in the [Creating Flatten Views](https://community.denodo.com/docs/html/browse/8.0/en/vdp/administration/creating_derived_views/creating_flatten_views/creating_flatten_views) section of the Virtual DataPort Administration Guide. Once I have done this, I can combine the results of the Flattened arrays into a single view.
You can also refer to this [previously answered Community Question](https://community.denodo.com/answers/question/details?questionId=9060g000000TRAjAAO&title=How+to+handle+XML+data+sources) for more information.
Hope this helps!