Simplify the following text for a Grade 7 native English-speaking person.
Original: The Lancia Thema was an executive car produced by the Italian automaker Lancia between 1984 and 1994 , and was one of four cars to share the `` Type Four '' chassis alongside the Alfa Romeo 164 , Fiat Croma and Saab 9000 .
Simplified: The Lancia Thema is a automobile produced by Lancia . It replaced the Lancia Gamma in 1984 , and were replaced by the Lancia Kappa in 1994 .