Complex sentence: Madame de Neuillant, the mother of Françoise's godmother Suzanne, brought her to Paris and introduced her to sophisticated women and men, who became vital links that she would need in the future.
Split into simpler sentences: Madame de Neuillant, the mother of Françoise's godmother Suzanne, brought her to Paris and introduced her to sophisticated women and men. They became vital links that she would need in the future.