Complex sentence: Although the last Cortina rolled off the production line in 1982, thousands of them remained in stock (with more than 11,000 being sold in 1983-something that badly compromised early Sierra sales), and the final six examples didn't find homes until 1987.
Split into simpler sentences: Although the last Cortina rolled off the production line in 1982, thousands of them remained unsold. More than 11,000 were sold in 1983, and the final six examples didn't find homes until 1987.