Task: Text Simplification
Input (English): It is sometimes possible for another person to tell when someone with BPD is dissociating , because their facial or vocal expressions may become flat or expressionless , or they may appear to be distracted ; at other times , dissociation may be barely noticeable .
Output (English): Sometimes other people can see when someone with BPD is dissociating because the expressions in their face or voice can seem emotionless , or they look like they are distracted .