Complex sentence: They find all the stars mysteriously gone, all the while landing on an asteroid populated by workaholic adults owned by the "Businessman" from the Little Prince's story, who captures and holds all the stars to power his asteroid and belongings.
Split into simpler sentences: They find all the stars mysteriously gone, all the while landing on an asteroid populated by workaholic adults owned by the "Businessman" from the Little Prince's story, who holds all the stars. The "Businessman", in the Little Prince's story, captures stars to power his asteroid and belongings.