Simplify the following text for a Grade 5 native English-speaking person.
Original: In 1965 , the La Trobe Building annex was opened to house the Library 's Australiana collection , which has since moved to the La Trobe Reading Room .
Simplified: In 1965 , the La Trobe Building was opened to hold the Library 's collection of Australian items . This has now been moved into the La Trobe Reading Room .