Simplify the following text for a Grade 9 native English-speaking person.
Original: Soon after his death , the Royal Academy of Music acquired the Yehudi Menuhin Archive , one of the most comprehensive collections ever assembled by an individual musician .
Simplified: Soon after his death , the Royal Academy of Music was given the Yehudi Menuhin Archive , a very large collection of musical books , letters etc. that had belonged to Yehudi Menuhin .