Simplify the following text for a Grade 9 native English-speaking person.
Original: After World War II , the two organizations became increasingly competitive , and in 1961 , the leadership of both the IRE and the AIEE resolved to consolidate the two organizations . The two organizations formally merged as the IEEE on January 1 , 1963 .
Simplified: After World War II , the leadership of both the IRE and the AIEE merged two organizations on January 1 , 1963 .