Complex sentence: These coupes were not available in large numbers, but are collected by some purists and are hard to sell, since gas consumption is high, compared to the 4-and 6-cylinder cars the Argentine consumer is used to.
Split into simpler sentences: These coupes were not available in large numbers, but are collected by enthusiasts. They are hard to sell, since gas consumption is high, compared to the 4-and 6-cylinder cars the Argentine consumer is used to.