Simplify the following text for a Grade 10 native English-speaking person.
Original: Lisa M. Buttenheim , a national of the United States , was appointed by the United Nations Secretary-General Ban Ki-moon as his Special Representative and Head of the United Nations Peacekeeping Force in Cyprus ( UNFICYP ) on 2 June 2010 .
Simplified: Lisa M. Buttenheim ( born 1954 ) , a national of the United States , is the Special Representative and Head of the United Nations Peacekeeping Force in Cyprus ( UNFICYP ) . She was appointed to the post by United Nations Secretary-General Ban Ki-moon on 2 June 2010 .