I've downloaded a model, and try to ungroup the model and learn how this model was made. However, the big model in the image below can not be ungrouped anymore.
I feel that this model is composed of a group of models, but I cannot ungroup this model and unlink it. Is there other methods to test if this model is a model or a group of models?
Thanks in advance.
Full Size: http://i.stack.imgur.com/VF2SM.png