What did extending the franchise in the united states mean?

In a franchise a trademark and the methods of a business can be used by a franchisee for a percentage of the monthly sales and a royalty fee.  The franchisee has the right to use the techniques, trademarks and distribute products for a set time according to a mutual agreement.  Extending the franchise means extending the time the franchisee uses the franchise.  

the language dates from the contacts of arabian traders with the inhabitants of the east coast of africa over many centuries. under arab influence, swahili originated as a lingua franca used by several closely related bantu-speaking tribal groups.