Complex sentence: The smaller Lincoln-Zephyr was introduced for the 1936 model year as a marque of its own, it featured a V12, it was very successful, its first year increased Lincoln sales almost ninefold.
Split into simpler sentences: The smaller Lincoln-Zephyr was introduced for the 1936 model year as a marque of its own, featuring a V12. The Lincoln-Zephyr was very successful and in its first year increased Lincoln sales almost ninefold.