Complex sentence: Since its launch in 2008, Truvia natural sweetener has become the second best selling sugar substitute in the United States, surpassing both Merisant's Equal and Cumberland Packing Corporation's Sweet'n Low, although the top-selling sugar substitute Splenda retains approximately 60% market share.
Split into simpler sentences: Since its launch in 2008, Truvia natural sweetener has become the second best-selling sugar substitute in the United States, surpassing both Merisant's Equal and Cumberland Packing Corporation's Sweet'n Low. Nonetheless, the top-selling sugar substitute Splenda retains approximately 60% market share.