Complex sentence: They and their descendants provided for such "adopted" status in the Chippewa Cree Tribal Constitution, which they wrote in 1934-1935 and which was certified by the Department of the Interior in 1935 under the Indian Reorganization Act.
Split into simpler sentences: They and their descendants provided for such "adopted" status in the Chippewa Cree Tribal Constitution, which was written in 1934-1935. It was certified by the Department of the Interior in 1935 under the Indian Reorganization Act.