Complex sentence: Dr. Julius Hensel was the first agricultural scientist of the 19th century to discover the benefits of micronized rocks to replace all chemical and animal fertilizers, with focus on rocks rich in trace minerals, also known as rock dust or stone meal.
Split into simpler sentences: Dr. Julius Hensel was the first agricultural scientist of the 19th century to discover the benefits of micronized rocks to replace all chemical and animal fertilizers. His primary focus was on rocks rich in trace minerals, also known as rock dust or stone meal.