Sentence:  There are more stems per item in Athabascan , which expresses the fact that the Athabascan languages have undergone somewhat more change in diverging from proto <WSD>Athabascan</WSD> than the Yokuts languages from proto Yokuts . 
Meaning of the word marked with <WSD> tags:  a group of Amerindian languages (the name coined by an American anthropologist, Edward Sapir)