Researchers claim that human personality is formed during childhood development.
.... well.... first, researchers find facts through their studies and not claim. You can also say, "Research studies have proved that ..." . Then, I don't understand why you included the "Researches" part here. You can simply make a more general statement which sounds more convincing;
Human personality gets formed during childhood development.Researchers claim that human personality is formed during childhood development. During this period, children learn basic skills that they will use later in their life. One of these fundamental skills is the ability of social communication.
... Up to this point in your introduction, you have failed to introduce your topic to the reader, which should have the first priority in writing your introduction. Try to stay with your prompt without deviating too much into other areas.