Complex sentence: He lived in Paris until 1914, when he moved with his family to Maine and New York, where he worked for Curtis, Mallet-Prevost & Colt until 1924, when he moved back to Mexico City.
Split into simpler sentences: He lived in Paris until 1914, when he moved with his family to Maine and New York. There, he worked for Curtis, Mallet-Prevost & Colt until 1924, when he moved back to Mexico City.