Original sentence: The main features of the disorder are: lack of pain sensation, painless injuries of the arms, legs and oral structures, fever during hot weather because of inability to sweat, mental retardation, infection and scarring of the tongue, lips and gums, chronic infections of bones and joints, bone fractures, multiple scars, osteomyelitis and joint deformities, which may lead to amputation
Edited sentence: The main features of the disorder are lack of pain sensation, painless injuries of the arms, legs and oral structures, fever during hot weather because of inability to sweat, mental retardation, infection and scarring of the tongue, lips and gums, chronic infections of bones and joints, bone fractures, multiple scars, osteomyelitis and joint deformities, which may lead to amputation