Complex sentence: Art historian Betty Snowden reviewed the collection of World War I drawings, and observed the influence of the post-impressionist movement to which Rae was exposed when first she came to France, and her attention to the regimentation and tensions of camp life.
Split into simpler sentences: Art historian Betty Snowden reviewed the collection of World War I drawings. She observed the influence of the post-impressionist movement to which Rae was exposed when first she came to France, and her attention to the regimentation and tensions of camp life.