Complex sentence: LiH was formed by laser ablation of lithium metal into a cryogenic helium buffer gas at a temperature between 1 and 5 K. The proportion of LiHe molecules was proportional to the density of He, and declined as the temperature increased.
Split into simpler sentences: LiH was formed by laser ablation of lithium metal into a cryogenic helium buffer gas at a temperature between 1 and 5K. He proportion of LiHe molecules was proportional to the density of He, and declined as the temperature increased.