Answer:
Compound ideas, although derived from experience, are formed by the mind by combining simple ideas, so the mind acquires an active role in the production of such compound ideas (such as ideas of beauty, gratitude, universe, etc.).
Step-by-step explanation:
The understanding selects several ideas, gathers and associates them and ends up synthesizing them into a compound idea of a higher level than the original ones.
The most abstract, more elaborate ideas such as the notion of beauty, eternity, infinity, etc. They are compound ideas (this always according to Locke who was the creator of the differentiation between simple ideas and complex ideas).
An example is the game of billiards: if I hit a billiard ball with the stick, I transmit energy to it, then the ball moves. In other words, a cause (hitting the billiard ball with the stick) is followed by an effect (the billiard ball moves).