Complex sentence: The Vigor started out in Japan only in the early 1980s as an upper trim level Accord, with later generations of the Vigor moved upmarket and received a shared platform with the luxury oriented Honda Inspire, and the engine sat longitudinally like the second generation Acura Legend.
Split into simpler sentences: The Vigor started out in Japan only in the early 1980s as an upper trim level Accord. With later generations the Vigor moved upmarket and received a shared platform with the luxury oriented Honda Inspire: its engine now sat longitudinally as in the second generation Acura Legend.