Complex sentence: Such closed-bladder inflated wings differ from open-cell ram-air inflation like the Domina Jalbert parfoil kite; also open single-surface flexible sails are often stated as being simply inflated by the wind.
Split into simpler sentences: Such closed-bladder inflated wings differ from open-cell ram-air inflation like the Domina Jalbert parafoil kite. Open single-surface flexible sails are also often considered to be simply inflated by the wind.