Complex sentence: In 1923, Marie came to know an Italian sculptor, who was living at Shimla at the time and in 1924 when he returned to Italy, she too moved to Italy along with Amrita and got her enrolled at Santa Annunziata, an art school at Florence.
Split into simpler sentences: In 1923, Marie came to know an Italian sculptor, who was living at Shimla at the time. In 1924, when he returned to Italy, she too moved there along with Amrita and got her enrolled at Santa Annunziata, an art school at Florence.