Original sentence: A second explains that rather than being related to the Dorset, the Sadlermiut were in fact descendants of the Thule, whose geographically isolated culture would have developped idiosyncratically from the mainland Thule culture
Edited sentence: A second explains that rather than being related to the Dorset, the Sadlermiut were in fact descendants of the Thule, whose geographically isolated culture would have developed idiosyncratically from the mainland Thule culture