Complex sentence: Returning to Paris, Dumouriez encountered popular ovation; but he gained less sympathy from the revolutionary government; his old-fashioned methodical method of conducting war exposed him to the criticism of the ardent Jacobins, and a defeat would mean the end of his career.
Split into simpler sentences: Returning to Paris, Dumouriez encountered popular ovation, but he gained less sympathy from the revolutionary government. His old-fashioned methodical method of conducting war exposed him to the criticism of ardent Jacobins, and a defeat would have meant the end of his career.