Simplify the following text for a Grade 10 native English-speaking person.
Original: The post of DCI was established by President Harry Truman on January 23 , 1946 , with Admiral Sidney Souers occupying the position ; it thus predates the establishment of the Central Intelligence Agency .
Simplified: The Office of United States Director of Central Intelligence ( DCI ) was established by U.S. President Harry Truman on January 23 1946 with Admiral Sidney Souers occupying the position .