Simplify the following text for a Grade 10 native English-speaking person.
Original: Rattle was very impressed and invited Harding to be assistant conductor to him at the City of Birmingham Symphony Orchestra for a year , from 1993-1994 .
Simplified: After listening to this tape , Rattle hired Harding as an assistant to him at the City of Birmingham Symphony Orchestra for a year , from 1993-1994 .