Help! I can't ungroup inserted rhino files

Im in the process of doing a group modeling project that requires me to use the grouped files that I inserted into the document. No matter the amount of times I use the command ‘ungroup’ they remain grouped and I cannot edit the individual pieces of the inserted model file.

Hopefully someone can help me out,

Those “groups” might be “blocks”.
You ungroup groups.
You Explode inserted block instances.

You’re right! Can’t believe I didn’t try that.

Thanks so much!