Simplify the following text for a Grade 6 native English-speaking person.
Original: The Alfa Romeo 156 ( known internally as the type 932 ) is a compact executive car introduced by Italian automaker Alfa Romeo at the 1997 Frankfurt Motor Show as the replacement for the Alfa Romeo 155 .
Simplified: The Alfa Romeo 156 is a automobile produced by Alfa Romeo . It replaced the Alfa Romeo 155 in 1997 , and were replaced by the Alfa Romeo 159 in 2005 .