Simplify the following text for a Grade 13 native English-speaking person.
Original: However , much of the study of nonverbal communication has focused on face-to-face interaction , where it can be classified into three principal areas : environmental conditions where communication takes place , the physical characteristics of the communicators , and behaviors of communicators during interaction .
Simplified: Nonverbal communication has three main aspects : the situation where it takes place , the communicators , and their behavior during the interaction .