Complex sentence: A method to lessen the magnitude of the continual heating and cooling of a single-expansion steam engine that leads to inefficiency was invented in 1804 by British engineer Arthur Woolf, who patented his stationary "Woolf high-pressure compound engine" in 1805.
Split into simpler sentences: A method to lessen the magnitude of the continual heating and cooling of a single-expansion steam engine that leads to inefficiency was invented in 1804 by British engineer Arthur Woolf. Woolf patented his stationary "Woolf high-pressure compound engine" in 1805.