Complex sentence: During an attempt to rescue Elchi, Biel is killed, but not before revealing the truth about the Innocent to Jiron and the others, that the Innocent have created the civilians as a race that will be able to live in the harsh environment on their planet.
Split into simpler sentences: During an attempt to rescue Elchi, Biel is killed, but not before revealing the truth about the Innocent to Jiron and the others. The Innocent have created the civilians as a race that will be able to live in the harsh environment on their planet.