Complex sentence: A blend typically contains whisky from many distilleries so that the blender can produce a flavour consistent with the brand, and the brand name (e.g., Chivas Regal, Cutty Sark) will usually not therefore contain the name of a distillery.
Split into simpler sentences: A blend typically contains whisky from many distilleries so that the blender can produce a flavour consistent with the brand. The brand name (e.g., Chivas Regal, Cutty Sark) usually does not, therefore, contain the name of a distillery.