Complex sentence: In 1675, he moved from Ambert to Paris and was elected in 1685 to join the Académie Royale des Sciences and became a "Pensionnaire Géometre" of the "Académie" (1699).
Split into simpler sentences: In 1675, he moved from Ambert to Paris and was elected in 1685 to join the Académie Royale des Sciences. He became a "Pensionnaire Géometre" of the "Académie" (1699).