Answer:
"There is a ravine near the forest, but the wild boars in the forest would wallow in it."
Step-by-step explanation:
A compound sentence is a sentence where there are two independent clauses joined together by a comma, conjunction, or semicolon. It also may include the coordinating conjunction for, and, nor, but, or, yet, so (FANBOYS).
In using the given words "ravine" and "wallow" in a sentence, the two independent clauses can be "there is a ravine near the forest" and "the wild boars in the forest would wallow in it". And taking these two independent clauses to make a compound sentence, the new compound sentence will be-
"There is a ravine near the forest, but the wild boars in the forest would wallow in it."