Complex sentence: Iron (I) hydride is a chemical compound of iron and hydrogen with chemical formula FeH, that has been detected in isolation only in extreme environments like the atmosphere of cool stars, or as a gas at temperatures above the boiling point of iron.
Split into simpler sentences: Iron (I) hydride is a chemical compound of iron and hydrogen with chemical formula FeH. It has been detected in isolation only in extreme environments like the atmosphere of cool stars, or as a gas at temperatures above the boiling point of iron.