Original sentence: (See Hindenburg disaster for a detailed discussion of this controversy.) The relatively high cost of helium compared to hydrogen has led several researchers to reinvestigate the safety issues of hydrogen as a lifting gas with some positive conclusions regarding its use given sufficient pilot training.However Addison Bain in 1997 published a paper discounting the role of hydrogen as a cause of the fire on the Hindenburg.Instead he focused attention on the role of the skin material of the Zeppelin which contained some of the same components as Thermite, a rocket propellant.Other researchers have recently conducted analyses and experiments that substantially refute Bain's theory.The German Zeppelin Hindenburg is the frequently cited example for risks posed by hydrogen.There is an ongoing debate about Bain's analysis and and the safety of hydrogen as a lifting gas
Edited sentence: Instead he focused attention on the role of the skin material of the zepplin which unintentionally had been composed of Thermite a rocket propellant ingredient and also studied the testimony of eyewitnesses.The German zepplin Hindenburg is the common example for hydrogen being a poor choice for a lifting gas; however Addison Bain in 1997 published a paper discounting the role of hydrogen as a cause of the explosion of the Hindenburg.The relatively high cost of helium compared to hydrogen has caused several researchers to reinvestigate the real safety issues of hydrogen as a lifting gas with positive conclusions regarding it's safe useage with sufficient training.There is an ongoing debate about his study and and the safety of hydrogen as a lifting gas