Complex sentence: Yogi Nath is a Shaivism-related group of monks who emerged by about 13th-century, sometimes called "Jogi" or simply "Yogi", known for a variety of siddha yoga practices.
Split into simpler sentences: Yogi Nath is a Shaivism-related group of monks which emerged around the 13th-century. They are sometimes called "Jogi" or simply "Yogi", and are known for a variety of siddha yoga practices.