Complex sentence: Using a universal translator, the Ambassador of the Martians announces that they intend to colonize the Earth; but to prevent this from causing panic, the translator is reprogrammed to say that the Martians "come in peace".
Split into simpler sentences: Using a universal translator, the Ambassador of the Martians announces that they intend to colonize the Earth. To prevent this intention from causing panic, the translator is reprogrammed to say that the Martians "come in peace".