Complex sentence: Leeds acne grading technique counts and categorizes acne lesions on the face, back, and chest into inflammatory and non-inflammatory with scores ranging from 0 (least severe) to 10 (most severe) though modified scales have a maximum score of 12.
Split into simpler sentences: Leeds acne grading technique counts acne lesions on the face, back, and chest and categorizes them as inflammatory or non-inflammatory. Leeds scores range from 0 (least severe) to 10 (most severe) though modified scales have a maximum score of 12.