Complex sentence: In 1949, Syngman Rhee government established the Bodo League was to keep an eye on its political opponents, most of them were innocent farmers and civilians who were forced into membership.
Split into simpler sentences: In 1949, the Syngman Rhee government established the Bodo League in order to keep an eye on its political opponents. The majority of the Bodo League's members were innocent farmers and civilians who were forced into membership.