Complex sentence: The Society of American Indians was the forerunner of modern American Indian organizations such as the National Congress of American Indians, and the founding conference of the National Congress of American Indians in 1944 much resembled the founding of the Society of American Indians in 1911.
Split into simpler sentences: The Society of American Indians was the forerunner of modern American Indian organizations such as the National Congress of American Indians. The founding conference of the National Congress of American Indians in 1944 much resembled the founding of the Society of American Indians in 1911.