Complex sentence: The Swedish Federation for Lesbian, Gay, Bisexual and Transgender Rights (RFSL), one of the world's oldest LGBT organizations, originated in October 1950 as a Swedish branch of The Danish Federation of 1948.
Split into simpler sentences: The Swedish Federation for Lesbian, Gay, Bisexual and Transgender Rights (RFSL) is one of the world's oldest LGBT organizations. It was founded in October 1950 as a Swedish branch of The Danish Federation of 1948.