Complex sentence: Later the liquid nitrogen refrigerator was invented by Union Carbide with money given to them by John Rockefeller Prentice, who used it exclusively for his bull stud before a number of years later giving it to the entire A.I. industry at no charge or royalty.
Split into simpler sentences: Later the liquid nitrogen refrigerator was invented by Union Carbide with money given to them by a man named Rockerfeller Prentice. Who used it exclusively for his bull stud before a number of years later giving it to the entire A.I. industry at no charge or royalty.