Complex sentence: The BSA first used the badge as an award for Scouts and Scouters who participated in an international Scouting event from early 1956 through 1991; requirements were devised by each council.
Split into simpler sentences: The BSA first used the badge as an award for Scouts who participated in an international Scouting event from early 1956 through 1991. It was awarded to Scouts and Scouters who had participated in an international Scouting event with requirements devised by each council.