Simplify the following text for a Grade 6 native English-speaking person.
Original: The change to that day 's St. Louis Browns scorecard , listing Gaedel and his uniform number , had gone unnoticed by everyone except Harry Mitauer , a writer for the St. Louis Globe-Democrat .
Simplified: The change to that day 's St. Louis Browns scorecard , listing Gaedel , was not seen by anybody except Harry Mitauer , a writer for the St. Louis Globe-Democrat .