Complex sentence: The Hopeful Monster theory was proposed by Richard B. Goldschmidt He proposed his "Hopeful Monster" theory in 1940 to try to explain missing links in the fossil record in his book, "The Material Basis of Evolution".
Split into simpler sentences: The Hopeful Monster theory was proposed by Richard B. Goldschmidt to explain the gaps in the fossil record. Goldschmidt proposed his "Hopeful Monster" theory in 1940 to try to explain missing links in the fossil record when he published his book, "The Material Basis of Evolution".