Complex sentence: Hobo-king candidates are screened the days before the annual King and Queen election and coronation, for their knowledge and history of riding trains, and how well they would represent the hobo community.
Split into simpler sentences: Hobo-king candidates are screened the days before the annual King and Queen election and coronation. They are expected to have knowledge and experience in riding trains, and are evaluated for how well they would represent the hobo community.