Answer:
A complex sentence is an independent clause (a sentence that can stand on its own) with 1 or more dependent clauses added (dependent clauses can't stand on their own as a sentence).
Explanation:
Here’s the bee movie script
The noun clause that completes the sentence and makes it grammatically correct is what I want to do in the future.
Teaching is what I want to do in the future.
It means, for example if I say, "I go to the park every now and then", then it isn't a common event, but happens often enough not to be classified as a rarity.