Simplify the following text for a Grade 9 native English-speaking person.
Original: As a result of the development of these two airports , Tempelhof was closed in October 2008 , while Gatow is now home of the Museum of the German Luftwaffe and a housing development .
Simplified: As a result of these two airports Tempelhof is being closed , whilst Gatow no longer serves as an airport and now hosts the Museum of the German Luftwaffe .