Simplify the following text for a Grade 13 native English-speaking person.
Original: Walthamstow Central is a London Underground and commuter rail station where the Victoria line terminates and the branch of the London commuter rail network operated by National Express East Anglia ( commuter trains in northeast London originating at ) .
Simplified: Walthamstow Central is a London Underground Victoria Line station and a commuter railway station on the Chingford branch of the Lea Valley Lines , operated by National Express East Anglia .