The reason why furs become worthless in summer is, that all fur-bearing animals shed their coats, or at least 
(furs; become; worthless; T:in summer) (The reason why furs become worthless in summer; is; that all fur-bearing animals shed their coats, or at least) Context(The reason why furs become worthless in summer is,List([0, 49))):(all fur-bearing animals; shed; their coats)
The reason why furs become worthless in summer is,List([0, 49))
furs The reason why furs become worthless in summer all fur-bearing animals
become is shed
worthless T:in summer
that all fur-bearing animals shed their coats, or at least
their coats