Simplify the following text for a Grade 6 native English-speaking person.
Original: The Melbourne zonal fare system is broken up into two ticketing Zones : Zone 1 ( Yellow ) and Zone 2 ( Blue ) . The two zones form concentric rings , with Zone 1 comprising the inner suburbs , and Zone 2 covering the remainder of metropolitan Melbourne .
Simplified: It allows the holder to use Trains , Trams and Buses , in two zones ( Zone 1 and Zone 2 ) .