Complex sentence: Administrators "sede vacante" or "sede plena", though, only serve in their role until a newly chosen diocesan bishop takes possession of the diocese and are restricted by Canon law in what they can do to the diocese they temporarily administer.
Split into simpler sentences: Administrators "sede vacante" or "sede plena" only serve in their role until a newly chosen diocesan bishop takes possession of the diocese. They are restricted by canon law in what they can do to the diocese they temporarily administer.