Simplify the following text for a Grade 10 native English-speaking person.
Original: It was adopted in 1950 following the recommendations of a committee appointed by the 1st Prime Minister of Ceylon , The Rt Hon D.S. Senanayake .
Simplified: It became the flag in 1950 following the recommendations of a committee appointed by the 1st Prime Minister of Sri Lanka D.S. Senanayake .