Simplify the following text for a Grade 14 native English-speaking person.
Original: The International Energy Agency ( IEA ; ) is a Paris-based autonomous intergovernmental organization established in the framework of the Organisation for Economic Co-operation and Development ( OECD ) in 1974 in the wake of the 1973 oil crisis .
Simplified: The International Energy Agency ( IEA ; ) is an autonomous intergovernmental organization created in 1974 after the 1973 oil crisis .