Complex sentence: At his next session, Albert expresses his frustration that while his speech has improved when talking to most people, he still stammers when talking to his own brother, and reveals the extent of Edward VIII's folly with Mrs. Simpson.
Split into simpler sentences: At his next session, Albert expresses his frustration that his speech has improved while talking to most people--except his own brother. Albert reveals the extent of Edward VIII's folly with Mrs. Simpson.