Simplify the following text for a Grade 10 native English-speaking person.
Original: In the course of Berlin 's 2001 administrative reform it was merged with the former borough of Wilmersdorf becoming a part of a new borough called Charlottenburg-Wilmersdorf .
Simplified: As a part of the changes to the boroughs of Berlin in 2001 Charlottenburg was joined with Wilmersdorf to make the new borough of Charlottenburg-Wilmersdorf .