It is not certain when language began. Obviously, spoken language could not have started until humans developed voice boxes9 or larynxes10.
It used to be thought that Neanderthal11 people could not have developed languages because they did not seem to have possessed larynxes. However, evidence has recently been found that shows that their society was more complex than was thought and so they must have had some kind of language, though it may have been simpler than most languages today.
On the other hand, it may have been more complex because ancient languages tend to be more complex than modern ones. This is because as time goes on, people simplify12 the way they speak as they come into contact with other people.
A simpler language is easier to learn and to understand and so makes communication with foreigners easier.