Complex sentence: Sunshine Biscuits made the Hydrox cookie, before it was discontinued in 1996 and is probably best known for producing Cheez-It snack crackers, which are still made under the Sunshine label.
Split into simpler sentences: Sunshine Biscuits made the Hydrox cookie, before it was discontinued in 1996. Today, Sunshine is probably best known for producing Cheez-It snack crackers, which are still made under the Sunshine label.