Complex sentence: Mendelian genetics, a series of 19th Century experiments with pea plant variations rediscovered in 1900, was integrated with natural selection by Ronald Fisher during the 1910s to 1930s, and along with J. B. S. Haldane and Sewall Wright he founded the new discipline of population genetics.
Split into simpler sentences: Mendelian genetics, a series of 19th Century experiments with pea plant variations rediscovered in 1900, was integrated with natural selection by Ronald Fisher during the 1910s to 1930s. Along with J. B. S. Haldane and Sewall Wright, Fisher founded the new discipline of population genetics.