Complex sentence: The UNU undertakes research into the pressing global problems of human survival, development and welfare that are the concern of the United Nations and its member states as well as serves purposes and principles of the Charter of the United Nations.
Split into simpler sentences: The UNU undertakes research into the pressing global problems of human survival, development and welfare that are the concern of the United Nations and its member states. UNU serves purposes and principles of the Charter of the United Nations.