Complex sentence: Some sports, such as athletics, divided athletes by both the category and severity of their disabilities, other sports, for example swimming, grouped competitors from different categories together, the only separation being based on the severity of the disability.
Split into simpler sentences: Some sports, such as athletics, divided athletes by both the category and severity of their disabilities. Other sports, such as swimming, grouped competitors from different categories together, the only separation being based on the severity of the disability.