Complex sentence: On Christmas Eve day, Cecile opens a gift that has been sent by her Aunt Clotilde in France--a creche (nativity) Cecile and Jacques assemble the figures in a stable of pine branches.
Split into simpler sentences: On Christmas Eve day, Cécile opens a gift that has been sent by her Aunt Clotilde in France--a crèche (nativity scene). Cécile and Jacques assemble the figures in a stable of pine branches.