Complex sentence: First browses all the workflows in its scope, check for Wikiproject templates, and if a subscribing Wikiproject/Taskforce is found, ArticleAlertbot will update a customized report called Article alerts for that particular WikiProject or Taskforce.
Split into simpler sentences: First browses all the workflows in its scope, then checks for Wikiproject templates. If a subscribing Wikiproject/Taskforce is found, ArticleAlertbot will update a customized report called "Article Alerts" for that particular WikiProject or Taskforce.