Complex sentence: But he will not go without his people--and will make sure that they do not either, he takes Teyla hostage and will only release her if Sheppard gives his people safe passage off the failing station.
Split into simpler sentences: But he will not go without his people--and will make sure that they do not either. He takes Teyla hostage and will only release her if Sheppard gives his people safe passage off the failing station.