Complex sentence: Some time later, while joining her aunt for a holiday in Monte Carlo, Vicky is visited on the train by Lermontov, who convinces her to return to the company to dance in a revival of "The Red Shoes".
Split into simpler sentences: Some time later, while joining her aunt for a holiday in Monte Carlo, Vicky is visited on the train by Lermontov. He convinces her to return to the company to dance in a revival of "The Red Shoes".