Before revision: The log driver, a daring tightrope walker of the rivers, was responsible for controlling the free floating of cut tree trunks that were thrown into a watercourse in order to reach a sawmill or a pulp and paper mill 
After revision: .The log driver, a daring tightrope walker of the rivers, was responsible for controlling the free floating of cut tree trunks that were thrown into a watercourse in order to reach a sawmill or a pulp and paper mill