Complex sentence: On May 15 an "Open Letter" remembering the Marines from the People of Nepal was posted, and it was thereafter replied to by Peter W. Bodde, Ambassador of the United States of America to Nepal.
Split into simpler sentences: On May 15 an "Open Letter" from the People of Nepal remembering the Marines was posted. It was thereafter replied to by Peter W. Bodde, Ambassador of the United States of America to Nepal.