Complex sentence: Unexpectedly, President Diệm then met with Châu ostensibly to discuss the well-written report, but in fact Diệm instead spoke at length of his high regard for Châu's mandarin grandfather and for his family in Huế, the former Vietnamese capital.
Split into simpler sentences: Unexpectedly, President Diệm then scheduled meeting with Châu ostensibly to discuss the well-written report. Instead Diệm spoke at length of his high regard for Châu's mandarin grandfather and for his family in Huế, the former Vietnamese capital.