Complex sentence: Normally, the rate of reabsortion increases as a physiological response to accumulating fluid, with the reabsorption rate increasing up to 40x before significant amounts of fluid accumulate within the pleural space.
Split into simpler sentences: Normally, the rate of reabsortion increases as a physiological response to accumulating fluid. In fact, the reabsorption rate may increase up to 40x before significant amounts of fluid accumulate within the pleural space.