Complex sentence: Though they had launched a publicity campaign to gain interest in the bike, even after they began to recieve inquiries they did not increase production, and between December, 1976 and October, 1979 they had only produced a total of six vehicles.
Split into simpler sentences: Though they had launched a publicity campaign to gain interest in the bike, even after they began to recieve inquiries they did not increase production. Between December, 1976 and October, 1979, they only produced a total of six vehicles.