Complex sentence: In 1961 the Greenville assembly won the right to perform marriages and became incorporated in 1962 and began to host inter-racial picnics and meetings, Human Rights Day and United Nations Day events proceeding from obscure venues in the late 1950s to premier ones by 1964.
Split into simpler sentences: In 1961 the Greenville assembly won the right to perform marriages and became incorporated in 1962. It then began to host inter-racial picnics and meetings with Human Rights Day and United Nations Day events proceeding from obscure venues in the late 1950s to premier ones by 1964.