Complex sentence: In 1989 three more "vitolas", the Robusto, the Exquisito, and the Espléndido, were added; the six are referred to as the "Línea Clásica" (classic line).
Split into simpler sentences: In 1989 three more "vitolas" were added: the Robusto, the Exquisito, and the Espléndido. These first six are now collectively known as the company's "Línea Clásica" (classic line).