Answer :
Balancing nouns with nouns, infinitives with infinitives, and prepositional phrases with prepositional phrases results in sentence structure with proper (subject/verb agreement OR pronoun reference OR parallelism).
The answer to your question would be that balancing nouns with nouns, infinitives with infinitives, and prepositional phrases with prepositional phrases results in sentence structure with proper parallelism.
Parallel structure, also known as parallelism, is the repetition of a grammatical form within a sentence. By making each idea in your sentence follow the same grammatical construction, you create a parallel structure.