Complex sentence: Hervé Jaubert (born 1956) is a former French Navy officer and marine engineer, who operated as a secret agent for the DGSE until 1993, when he moved to Florida where he set up a company to build and operate recreational submarines.
Split into simpler sentences: Hervé Jaubert (born 1956) is a former French Navy officer and marine engineer. In the French Navy he was a secret agent for the DGSE until 1993, when he moved to Florida where he set up a company to build and operate recreational submarines.