Simplify the following text for a Grade 12 native English-speaking person.
Original: It has a composition similar to 1 Ceres : a darkly colored surface that is heavily space-weathered with the composition of primitive organic compounds , including tholins .
Simplified: It is made up of stuff similar to 1 Ceres : a darkly colored surface that is heavily space weathered and made up of primitive organic compounds , including tholins .