Task: Text Simplification
Input (English): the proportion of c-types may actually be greater than this , because c-types are much darker than most other asteroid types except d-types and others common only at the extreme outer edge of the main belt.
Output (English): the proportion of c-types may actually be greater than this ; because c-types are much darker than most other asteroids except d-types and others common only at the extreme outer edge of the main belt.