Simplify the following text for a Grade 9 native English-speaking person.
Original: In 2005 , AECMA was subsumed by the Aerospace and Defense Industries Association of Europe ( ASD ) , which renamed its standard to ASD Simplified Technical English or STE . STE is defined by the specification ASD-STE100 , which is maintained by the Simplified Technical English Maintenance Group ( STEMG ) .
Simplified: ASD is the `` AeroSpace and Defense Industries Association of Europe '' . ASD has a Maintenance Group called STEMG that continues work on simplified English .