The correct translation is: Carlos y Sofía aprenderán mucho sobre la cultura de Puerto Rico en Jayuya.
In the example above, we can see the Spanish verb aprenderán, which is conjugated in futuro simple, modo indicativo (simple future tense, indicative mood) and we can see the modal verb will in the original sentence, which is also used to express future.
On the other hand, the second example is wrong because the spanish verb aprenden is conjugated in presente, modo indicativo (simple present tense, indicative mood).