Complex sentence: A considerable amount of progress on the design and analysis of experiments occurred in the early 20th century by statisticians such as Ronald Fisher, Jerzy Neyman, Oscar Kempthorne, Gertrude Mary Cox, and William Gemmell Cochran, among others.
Split into simpler sentences: A considerable amount of progress on the design and analysis of experiments occurred in the early 20th century. Statisticians, such as Ronald Fisher, Jerzy Neyman, Oscar Kempthorne, Gertrude Mary Cox, and William Gemmell Cochran, among others.