Simplify the following text for a Grade 4 native English-speaking person.
Original: The CitroÃ `` n XM is an executive car that was produced by the French automaker CitroÃ `` n between 1989 and 2000 .
Simplified: CitroÃ `` n XM was a car produced by CitroÃ `` n from 1989 through 2000 .