Simplify the following text for a Grade 11 native English-speaking person.
Original: A new pedestrian link to East Rail Kowloon Tong station southern concourse and a new entrance were completed in June 2003 to cope with the increase in interchange passenger flow .
Simplified: A new pedestrian link to Kowloon Tong Station southern concourse and a new entrance ( Exit D ) were opened on 15 April 2004 to cope with the increase in interchange passenger flow .