Complex sentence: The methods used by Atelier instructors may vary greatly from one studio to another; however, artists using the "Atelier" approach tend to be united in their desire to reintroduce classical methods and techniques to modern painting.
Split into simpler sentences: The methods used by Atelier instructors may vary greatly from one studio to another. However, artists using the "Atelier" approach tend to be united in their desire to reintroduce classical methods and techniques to modern painting.