Complex sentence: She studied at the Académie Julian under Charles Hoffbauer and Jean-Paul Laurens, and founded the Cours Critcher in 1905 in an attempt to aid American artists in gaining admission to French schools, an enterprise in which she had the assistance of Miller and Hoffbauer.
Split into simpler sentences: She studied at the Académie Julian under Charles Hoffbauer and Jean-Paul Laurens. She founded the Cours Critcher in 1905 in an attempt to aid American artists in gaining admission to French schools, an enterprise in which she had the assistance of Miller and Hoffbauer.