Simplify the following text for a Grade 8 native English-speaking person.
Original: They originally found great popularity among ranchers of the American Southwest , testament to the hardiness of the breed ; while originating in cool , moist Britain , they have proven to thrive in much harsher climates on nearly every continent .
Simplified: This is a testament to the hardiness of the breed ; while originating in cool , moist Britain , they have thrived in much harsher climates . The breed has adapted to a wide range of climates on nearly every continent .