Complex sentence: The Tandem Method is a form of selective breeding where a breeder addresses one characteristic of the animal at a time, thus selecting only animals that measure above a certain threshold for that particular trait while keeping other traits constant.
Split into simpler sentences: The Tandem Method is a form of selective breeding where a breeder addresses one characteristic of the animal at a time. Thus selecting only animals that measure above a certain threshold for that particular trait while keeping other traits constant.