Complex sentence: Captain Spock stated that the explosion of the moon Praxis burned off the atmosphere of the Klingon home world of Qo’noS, and due to the Klingons putting their entire empires wealth into its military it could not afford a large scale environmental repair of the planet's atmosphere.
Split into simpler sentences: Captain Spock stated that the explosion of the moon Praxis burned off the atmosphere of the Klingon home world of Qo’noS, and due to the Klingons putting their entire empires wealth into its Military. It could not afford a large scale environmental repair of the planet's atmosphere.