Original sentence: He was a skilled drawer, and hundreds of his drawings of brain cells are still used for educational purposes today.His pioneering investigations of the microscopic structure of the brain were original: he was considered by many to be the greatest neuroscientists of all time.Santiago Ramón y Cajal (1 May 1852 – 17 October 1934) was a Spanish histologist, psychologist, and Nobel laureate
Edited sentence: His pioneering investigations of the microscopic invention of the brain were so original that he was considered by many to be the greatest neuroscientists of all time.His skills as an artist allowed him to make hundreds of drawings still used for educational purposes today.Santiago Ramón y Cajal (1 May 1852 – 17 October 1934) was a Spanish histologist, psycologist, and Nobel laureate