Simplify the following text for a Grade 13 native English-speaking person.
Original: The other local government districts with city status that were abolished around this time ( Bath and Hereford ) had decided to appoint charter trustees to maintain the existence of the city and the mayoralty .
Simplified: Rochester upon Medway City Council did not appoint appoint Charter Trustees to maintain the existence of the city and the mayoralty so the city simply ceased to exist , because the council forgot .