Complex sentence: In 1967, the 1000F received the lifting tailgate that the car's design had always promised, and soon a four-door version (with a fastback styled rear but again without a tailgate) joined the lineup.
Split into simpler sentences: In 1967, the 1000F received the lifting tailgate that the car's design had always promised. Soon thereafter a four-door version (with a fastback styled rear but again without a tailgate) joined the lineup.