Complex sentence: Yvonne still lives with her aging father in what is left of old family estate- "Les Sablonnières" which is closer than the two young friends had first imagined in earlier years.
Split into simpler sentences: Yvonne still lives with her aging father in what is left of old family estates. It is called "Les Sablonnières" and is not as far as the two young friends had first imagined in earlier years.