Simplify the following text for a Grade 13 native English-speaking person.
Original: Tenders were called for the design , supply , installation and on-going maintenance of the system , with the ` OneLink Transit Consortium ' becoming the preferred tenderer in September 1993 .
Simplified: Tenders were called for the design , supply , installation and on-going maintenance of such a system , with the ` OneLink Transit Consortium ' announced as the preferred people to do it in September 1993 .