Complex sentence: Moon distance from Earth, heading away from the Sun. Initially assumed to be a comet, it was reclassified as an asteroid a week later, then the first of a new class of interstellar objects.
Split into simpler sentences: Moon distance from Earth, heading away from the Sun. Initially assumed to be a comet, it was reclassified as an asteroid a week later. It is the first of a new class of interstellar objects.