Complex sentence: The term super saloon could be used to describe a performance four-door saloon car fitted with a V8 engine, but another term, some times used is muscle car, but that normally relates to V8 powered two-door/coupe American cars.
Split into simpler sentences: The term super saloon could be used to describe a performance four-door saloon car fitted with a V8 engine. Another term sometimes used is muscle car, but that normally relates to V8-powered two-door coupe American cars.