I need a 12th grade level complex/compound sentence using a gerund.

We do not do homework. However, we'll be glad to critique YOUR sentence.

To construct a 12th grade level complex/compound sentence using a gerund, it's important to first understand what a gerund is. A gerund is a verb form ending in "-ing" that functions as a noun. Now, let's create a sentence using a gerund.

Example:

"Studying diligently for hours, Sarah improved her grades, and her dedication was recognized by the school."

In this sentence, the gerund "studying" functions as the subject of the sentence and is part of a compound structure. The sentence also includes a complex structure with two independent clauses joined by the coordinating conjunction "and." The gerund "studying" acts as the subject, while the rest of the sentence illustrates the action (Sarah improving her grades) and the result (her dedication being recognized by the school).

Keep in mind that this sentence is just an example, and you can create your own complex/compound sentence using a gerund. The key is to ensure that the gerund functions as a noun in the sentence while maintaining a complex or compound structure.