Simplify the following text for a Grade 5 native English-speaking person.
Original: In 1985 , MÃ st assumed the stage name Welser-M Ã st on suggestion of his mentor , Baron Andreas von Bennigsen of Liechtenstein , thus paying homage to the city of Wels where he grew up .
Simplified: In 1985 he changed his stage-name to `` Welser-M Ã st '' after the town of Wels where he grew up .