For explode multi-body part:
No. you can't translate name bodies, features, planes etc.
Great. Can you create/alter the multi bodies individually or will they all be in the part as one file?
If this is multi-body part all bodies are in one file, but you can click RMB on folder Solid Bodies in Property Manager and choice Save Bodies. Also here you can save multi-body part as assembly.
What if I wanted to make the assembly a multi body part? And can the mult body part run simulations?
How do I open the sketch in the part derived from the multi-body part?
Check this macro for language translation: VBA macro to rename features based on type names using SOLIDWORKS API
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