Complex sentence: It was very similar to the Renault 5, being identical mechanically but offered with a smaller range of engines, but had a saloon-style boot in place of the original R5's hatchback.
Split into simpler sentences: It was very similar to the Renault 5, being identical mechanically but offered with a smaller range of engines. The R7 had a saloon-style boot in place of the original R5's hatchback.