Complex sentence: In 1956 Leslie Cross, the society's vice-president, founded the Plantmilk Society to explore commercial soy milk production; the society became Plamil Foods and in 1965 began production of one of the first widely distributed soy milks in the Western world.
Split into simpler sentences: In 1956 Leslie Cross, the society's vice-president, founded the Plantmilk Society to explore commercial soy milk production. The Plantmilk Society became Plamil Foods, and in 1965 began production of one of the first widely distributed soy milks in the Western world.