Complex sentence: These are thought to be samples of the metallic core of differentiated asteroids that were fragmented in the early history of the Solar system by impacts, and originate in the inner portion of the asteroid belt and are thought to be the source of iron meteorites.
Split into simpler sentences: These are thought to be samples of the metallic core of differentiated asteroids that were fragmented in the early history of the Solar system by impacts. They originate in the inner portion of the asteroid belt and are thought to be the source of iron meteorites.