"Il est facile de voir que le moi est cette partie du ça qui a été modifiée par l'influence directe du monde extérieur."

Simplified Meaning:

The quote means that a person's ego is shaped by their instincts (id) but is also changed by their experiences in the world around them. Imagine a child who wants to eat candy all the time (id). As the child grows up, they learn that eating too much candy can cause problems like toothaches or bad health. So, the child's desire for candy is controlled by what they've learned from their environment (ego). This happens because they understand the consequences of eating too much candy, like their parents telling them it's bad or feeling the discomfort of a toothache. The child’s desire for candy (id) is still there, but now it’s mixed with the new understanding that too much candy isn’t good for them (ego). In our daily lives, everyone has basic desires and instincts, but these are balanced by what we learn from our families, friends, and society. For example, you might want to stay in bed all day (id), but you get up because you need to work or go to school (ego). This balance helps us act in ways that are good for us and fit in with the world around us.