Final answer:
Option (b) is the most effective way to rewrite sentence 14 with correct parallel structure, using parallel nouns and prepositional phrases.
Step-by-step explanation:
The most effective way to rewrite sentence 14 with correct parallel structure is option (b) - He also experienced marital separations, divorces, and estrangements from his daughters and sons at different periods.
This option maintains parallelism by using parallel nouns (marital separations, divorces, estrangements) and parallel prepositional phrases (from his daughters and sons) to create a cohesive and grammatically correct sentence.