Complex sentence: Brand loyalty, in marketing, consists of a consumer's commitment to repurchase or otherwise continue using the brand and can be demonstrated by repeated buying of a product or service, or other positive behaviors such as word of mouth advocacy.
Split into simpler sentences: Brand loyalty, in marketing, consists of a consumer's commitment to repurchase or continue to use the brand. It can be demonstrated by repeated buying of a product, service, or other positive behaviors such as word of mouth advocacy.