Simplify the following text for a Grade 13 native English-speaking person.
Original: This is thought to result from the sublimation-driven degradation of small landforms , which is supported by the general deficit of small impact craters and the presence of numerous small knobs , considered to be their remnants .
Simplified: This is thought to result from the degradation of small landforms , caused through sublimation , which is supported by the general lack of small impact craters and the presence of numerous small knobs , considered to be their remains .