Complex sentence: It is assumed that for the next two years Mrs. Conner and her children went to southern Arkansas, but when the tribe arrived in Kansas at the Delaware Reservation Makinges and her younger children were with them, they remained there until 1930.
Split into simpler sentences: It is assumed that for the next two years Mrs. Conner and her children went to southern Arkansas. When the tribe arrived in Kansas at the Delaware Reservation Makinges and her younger children were with them, where they remained there until 1930.