Complex sentence: Between 1733 and 1740, Jacques Cassini and his son César undertook the first triangulation of France, including a re-surveying of the meridian arc, leading to the publication in 1745 of the first map of France constructed on rigorous principles.
Split into simpler sentences: Between 1733 and 1740, Jacques Cassini and his son César undertook the first triangulation of France. They included a re-surveying of the meridian arc, leading to the publication in 1745 of the first map of France constructed on rigorous principles.