Complex sentence: In Botany, the term is synonymous with caryopses, the fruits of members of the grass family, but in agronomy and commerce, seeds or fruits from other families are also called grains if they resemble caryopses.
Split into simpler sentences: In botany, the term is synonymous with caryopses, the fruits of members of the grass family. In agronomy and commerce, seeds or fruits from other families are called grains if they resemble caryopses.