Complex sentence: Today, the Congress continues to be the most important Pan-Indian reform group, and non-natives continue to be drawn from much the same groups as the Society; churchmen, reformers, romantics and anthropologists.
Split into simpler sentences: Today, the Congress continues to be the most important Pan-Indian reform group. The white friends of the Indian are still drawn from much the same groups as the Society, churchmen, reformers, romantics and anthropologists.