Complex sentence: After the settlement, the popularity of SplitFire's spark plug range declined; in 2002, they were still considered a leading sparkplug manufacturer by 2015, the company's products were mostly gone from shelves and the official website had been removed.
Split into simpler sentences: After the settlement, the popularity of SplitFire's spark plug range declined. In 2002, it was still considered a leading sparkplug manufacturer, but by 2015, the company's products were not broadly distributed, and its official website had been removed.