Complex sentence: In 2004, an official of the USDA found a lump on a veal calf in a Wisconsin veal farm, which turned out to be an illegal hormone implant (such implants are only allowed legally for beef cattle).
Split into simpler sentences: In 2004, an official of the USDA found a lump on a veal calf in a Wisconsin veal farm. This lump turned out to be an illegal hormone implant (such implants are only allowed legally for beef cattle).