Complex sentence: They eventually suffered serious brand erosion in the early 1990s with the introduction of various "upscale" brands such as Kettle Chips and Miss Vickey's, and in 1996 the brand was replaced by Lay's in a major re-branding exercise.
Split into simpler sentences: They eventually suffered serious brand erosion in the early 1990s with the introduction of various "upscale" brands such as Kettle Chips and Miss Vickey's. In 1996 the brand was replaced by Lay's in a major re-branding exercise.