Plz interpret

Rule 6 of companies rule 2014 plz explain 1 para
[ii] the incoming auditor or audit firm shall not be eligible if such auditor or audit firm is associated with the outgoing auditor or audit firm under the same network of audit firms.

Explanation. I - For the purposes of these rules the term "same network" includes the firms operating or functioning, hitherto or in future, under the same brand name, trade name or common control.