Complex sentence: For the editorial novice, this project provides much needed validation, for not only have they learned about and experimented with editing for open content, they have also gained various indispensible skills to make them more marketable in the workforce.
Split into simpler sentences: For the editorial novice, this project provides much needed validation. Not only have students learned about and experimented with editing for open content, they have also gained various indispensible skills that will make them more marketable in the workforce.