Complex sentence: An 11-horsepower boiler heated the water in the water jacket; then the cream was cooled by placing ice and salt in four 18-inch metal pipes which ran from floor to ceiling in the butter storage room.
Split into simpler sentences: An 11-horsepower boiler heated the water in the water jacket. Cooling was achieved by placing ice and salt in 4 metal pipes (approx 18 inches in diameter) which ran from floor to ceiling in the butter storage room.