Complex sentence: The classification system takes several things into account when putting people into this class; these include which limbs are affected, how many limbs are affected, and how much of a limb is missing for people with amputations.
Split into simpler sentences: The classification system takes several things into account when putting people into this class. These includes which limbs are effected, how many limbs are effected, and how much of a limb is missing for people with amputations.