Complex sentence: Sesame plants are a rich source of vitamins and minerals, and Langham focused on cross-breeding the plant into more fruitful versions, and tried to look for other uses of sesame beyond a mere food source.
Split into simpler sentences: Sesame plants are a rich source of vitamins and minerals, and Langham focused on cross-breeding the plant into more fruitful versions. He also attempted to look for other uses of sesame beyond a mere food source.