Simplify the following text for a Grade 5 native English-speaking person.
Original: After six years , Rover 600 production ceased in the Spring of 1999 ; it was replaced with the retro-styled Rover 75 developed under BMW 's stewardship .
Simplified: The Rover 600 Series is a car produced by Rover . It replaced the Austin Maestro in 1993 , and were in 1999 replaced by the Rover 75 .