Expresses the idea that as one thing changes, so does another; 'as', 'along with', 'while'.
Long explanation:
The ~につれて grammar point is used to express the idea that as one thing changes or progresses, another thing changes or progresses simultaneously. In English, it can be translated as 'as', 'along with', or 'while'. This grammar point can be used with verbs, い-adjectives, な-adjectives, and nouns.