Complex sentence: In 1987 the only local parts used in one car, the Volkswagen Santana, were tires, radio, and antenna, but by 1998 over 90% of the components used in its manufacture were locally sourced.
Split into simpler sentences: In 1987 the only local parts used in one car, the Volkswagen Santana, were tires, radio, and antenna. By 1998 over 90% of the components used in its manufacture were locally sourced.