Complex sentence: The Swedish Boy Scouts were among the charter members of the World Organization of the Scout Movement in 1922, the Girl Guides were among the founders of the World Association of Girl Guides and Girl Scouts in 1928.
Split into simpler sentences: The Swedish Boy Scouts were among the charter members of the World Organization of the Scout Movement in 1922. The Girl Guides were among the founders of the World Association of Girl Guides and Girl Scouts in 1928.