Simplify the following text for a Grade 11 native English-speaking person.
Original: It shares the same bodyshell and core structure as the Turbostar , which is in turn the most common post-privatisation diesel multiple unit ( DMU ) family , and both evolved from the Class 168 Clubman design by ADtranz .
Simplified: It shares the same bodyshell and core structure as the Turbostar , which is in turn the most common post-privatisation diesel multiple unit family .