Complex sentence: The Alliance was a 4-door sedan, launched in June 1982 as a 1983 model and althouygh it was branded as a Renault, the car bore AMC's logo on rear window decals.
Split into simpler sentences: The Alliance was a 4-door sedan, launched in June 1982 as a 1983 model. Although it was branded as a Renault, the car bore AMC's logo on rear window decals.