Complex sentence: In order to introduce gas into the bladder, the gas gland excretes lactic acid and produces carbon dioxide the resulting acidity causes the hemoglobin of the blood to lose its oxygen (Root effect) which then diffuses partly into the gas bladder.
Split into simpler sentences: In order to introduce gas into the bladder, the gas gland excretes lactic acid and produces carbon dioxide. The resulting acidity causes the hemoglobin of the blood to lose its oxygen (Root effect) which then diffuses partly into the gas bladder.