Simplify the following text for a Grade 9 native English-speaking person.
Original: He was President of the European Bank for Reconstruction and Development from 1998 to 2000 and head of the International Monetary Fund ( IMF ) from 2000 to 2004 .
Simplified: He was President of the European Bank for Reconstruction and Development from 1998 to 2000 . He also served as the head of the International Monetary Fund ( IMF ) from 2000 to 2004 .