@S_Motch_Perrine
What you ask is normally done during the segmentation process. If you still have the segmentation of these models, you can run the island effect and instead of the default “keep largest component” choose “split islands to segments”. If they are not touching each other, then you should get three separate segments, and export models from there. Also this thread might be useful to deal with touching voxels. How can I approximate the magic wand tool in Avizo/Amira? - #4 by muratmaga
If you do not have the segmentation, but only the models you have couple options.
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I don’t think surface toolbox has the split islands mode exposed in the UI, but it might possibly be available as a python script (someone more knowledgable needs to comment @pieper ?)
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You can import/convert the models as segmentation then use the segment editor effects (such as island and scissors) to separate them and re-export as model. This might cause some loss of detail, as ideally this operation should be done as I described above. To give a try, right click on your models object in the data viewer, and choose “export to model to segmentation node”.
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You might give “Dynamic Modeler” module a try, and experiment with separating the models with drawing closed curves around them.