Simplify the following text for a Grade 6 native English-speaking person.
Original: The Volkswagen LT was the largest light commercial vehicle panel van produced by Volkswagen ( and subsequently Volkswagen Commercial Vehicles as of 1996 ) from 1975 to 2006 .
Simplified: The Volkswagen LT is a range of vans and buses produced by Volkswagen . It were introduced in 1975 , and replaced by the Volkswagen Crafter in 2006 .