When you keep something for a specific use
Maybe put it in parenthesis or maybe wait until the next paragraph. I'm not sure it all depends on your teacher.
Elie Wiesel, Night (The Night Trilogy, #1) Page 4
Despite the difficulties and circumstances in which the people live, they have not abandoned science because they are certain that they are the fruit of the future, with which they will change the present to a better future.
To build the context of the controversy
