Complex sentence: The producers observe that since incentive is readjusted based on their production, any increase in production confers only a temporary increase in incentive while requiring a permanent greater expenditure of work, and thus decide not to reveal hidden production capacity unless forced to do so.
Split into simpler sentences: The producers observe that since incentive is readjusted based on their production, any increase in production confers only a temporary increase in incentive while requiring a permanently greater expenditure of work. They therefore decide not to reveal hidden production capacity unless forced to do so.