Complex sentence: The script is called once daily by a cronjob to retrive, format, and cache the content for use on their site to feature relavent Wikipedia articles and media and encourage their users to help develop the Naval History page.
Split into simpler sentences: The script is called once daily by a cronjob which retrives, formats, and caches the content to use on the site. The site features relavent Wikipedia articles and media to their audience and encourages their users to help develop the Naval History page.