Complex sentence: Now secure from the possibility of a Manticoran attack on the Haven System itself, Saint-Just turns to internal matters and the consolidation of his grip on power, and orders the arrest of Admirals Lester Tourville and Javier Giscard, whom he sees as political dissidents.
Split into simpler sentences: Now secure from the possibility of a Manticoran attack on the Haven System itself, Saint-Just turns to internal matters and the consolidation of his grip on power. He orders the arrest of Admirals Lester Tourville and Javier Giscard, whom he sees as political dissidents.