Final answer:
To correct faulty parallelism, revise the sentence to 'Jackson was both the author of the play and the leading actor,' maintaining the same grammatical structure throughout.
Step-by-step explanation:
To correct the error of faulty parallelism in the sentence, we need to ensure that the sentence follows the same grammatical structure. In the sentence 'Jackson was both the author of the play and he was the leading actor,' the parallel structure is disrupted by the addition of 'he was' in the second part. A revision for clarity and parallelism could be 'Jackson was both the author of the play and the leading actor.'
In writing, parallelism is a technique that involves using repetitive structures to create balance and rhythm in a sentence. An example of correct parallelism from a famous speech is found in John F. Kennedy's inaugural address, where he utilized parallelism to organize and emphasize ideas.