Complex sentence: Together, Paul and Michelle decide to run away; they travel to the idyllic marshlands of the Camargue where Michelle has in her keeping a very small cottage that she and her recently deceased artist father periodically escaped to from their home in Arles.
Split into simpler sentences: Together, Paul and Michelle decide to run away; they travel to the idyllic marshlands of the Camargue where Michelle has in her keeping a very small cottage. She and her recently deceased artist father periodically escaped to the cottage from their home in Arles.