Simplify the following text for a Grade 10 native English-speaking person.
Original: Bruno Brun ( born 1910 in Hrastnik , Austro-Hungary , now Slovenia - died 1977 in Belgrade , Yugoslavia , now Serbia ) was a Yugoslavian clarinetist and professor at the Academy of Music in Belgrade .
Simplified: Bruno Brun ( 1910 â '' 1977 ) was Yugoslavian clarinet player and professor at the Music Academy in Belgrade .