Complex sentence: As the Neosapien forces retreated from Venus, Thrax was ordered by General Draconis to detonate an atomic bomb underneath Vesta City, however, recognizing that the battle was lost and unwilling to kill civilians, Thrax refused to carry out this assignment.
Split into simpler sentences: As the Neosapien forces retreated from Venus, Thrax was ordered by Draconis to detonate an atomic bomb in Vesta City. Recognizing that the battle was lost, and unwilling to kill civilians, Thrax refused to carry out this assignment.