Fix sentence flow: It hindered growth and weakened the vitality of entire stands of trees. As a result, early on resin collecting was restricted to stands that were not easily felled and transported i.e. those that were a long way from rivers.
It hindered growth and weakened the vitality of entire stands of trees. Early on resin collecting was restricted to stands that were not easily felled and transported i.e. those that were a long way from rivers.