Simplify the following text for a Grade 4 native English-speaking person.
Original: Pallant House Gallery , winner of the 2007 gallery of the year Gulbenkian Prize has a major collection of chiefly modern British art and in 2006 opened its new extension that houses the collection of Professor Sir Colin St John Wilson .
Simplified: Pallant House Gallery won the 2007 gallery of the year Gulbenkian Prize . It has a lot of modern British art .