Simplify the following text for a Grade 7 native English-speaking person.
Original: Because of the high background density of asteroids in this part of space , one might expect that a great number of interlopers ( asteroids unrelated to the collision that formed the family ) would be present .
Simplified: Because of the high background density of asteroids in this part of space , one might expect that a great number of asteroids unrelated to the collision that made the family would be present . However , few have been found .