sentence: Stephen O'Brien, the United Nations Under-Secretary-General for Humanitarian Affairs and Emergency Relief Coordinator, has said that more than 20 million people faced the threat of starvation and famine in Yemen, Somalia, South Sudan and Nigeria.
modified: fix grammar: Stephen O'Brien, United Nations Under-Secretary-General for Humanitarian Affairs and Emergency Relief Coordinator, has said that more than 20 million people faced the threat of starvation and famine in Yemen, Somalia, South Sudan and Nigeria.