Coordinating conjunctions link ideas of equal importance. When those ideas are closely parallel in content, they should be expressed in parallel grammatical form.
The revision balances the nouns suspension and expulsion.
The revision balances the verb reducing with the verb extending.
Exercise: Identifying parallel structure
Exercise: Parallelism 1
Exercise: Parallelism 2
Exercise: Parallelism 3
Exercise: Parallelism 4
coordinating conjunction and, but, or, nor, for, so, yet; used to join elements of equal grammatical form.