Split and simplify the following sentence while retaining its full meaning: Whereas the powers of national representatives conducting enquiries in other Member States should be defined; whereas provision should also be made for Commission representatives to be present , where justified , at national enquiries concerning mutual administrative assistance , and for their powers to be defined.
 Simplified version:
The powers of national officials investigating in another Member State should be clearly defined . Likewise , provision should be made for Commission officials , where justified , to be present during national investigations as part of mutual administrative assistance and their powers should be clearly defined .