Complex sentence: The car was initially priced competitively (one of the articles had a comparison?) and about 20 were sold before the manufacturers reviewed their manufacturing costs and found themselves obliged to increase the car's price considerably, at which point customer demand disappeared.
Split into simpler sentences: The car was initially priced competitively (one of the articles had a comparison?). About 20 were sold before the manufacturers reviewed their manufacturing costs and found themselves obliged to increase the car's price considerably, at which point customer demand disappeared.