Complex sentence: Bort diamonds, found in Brazil, Venezuela, and Guyana, are the most common type of industrial-grade diamond, also polycrystalline and often poorly crystallized; they are translucent and cleave easily.
Split into simpler sentences: Bort diamonds, found in Brazil, Venezuela, and Guyana, are the most common type of industrial-grade diamond. They are also polycrystalline and often poorly crystallized; they are translucent and cleave easily.