Complex sentence: In the Lincoln model line, the Continental has served several roles, ranging from the flagship of the the Lincoln line in addition to its base-trim sedan; from 1961 to 1976, the Lincoln Continental was the sole nameplate sold by the division.
Split into simpler sentences: In the Lincoln model line, the Continental has served various roles, ranging from the top-trim sedan to the base-trim sedan. From 1961 to 1976, the Lincoln Continental was the sole model sold by the division.