Complex sentence: Although electromagnetic therapy became widely adopted in the German speaking countries of Western Europe, in North America, its use was restricted to animals and veterinarians became the first health professionals to use PEMF therapy-usually to heal broken legs in race horses.
Split into simpler sentences: Although electromagnetic therapy became widely adopted in Western Europe, its use was restricted to animals in North America. Veterinarians became the first health professionals to use PEMF therapy, usually to heal broken legs in race horses.