Complex sentence: They are produced by Swizzels Matlow, and are sold in bags of 80 g, 25 g and a smaller 10 g bag, they have gained cult status and are widely regarded as retro sweets.
Split into simpler sentences: They are produced by Swizzels Matlow, and are sold in bags of 80 g, 25 g and a smaller 10 g bag. They have gained cult status and have become widely regarded as retro sweets.