Simplify the following text for a Grade 16 native English-speaking person.
Original: Fourteen nations made their first official Olympic appearance at these Games : British Guiana ( now Guyana ) , Burma ( now Myanmar ) , Ceylon ( now Sri Lanka ) , Iran , Iraq , Jamaica , Korea , Lebanon , Pakistan , Puerto Rico , Singapore , Syria , Trinidad and Tobago , and Venezuela .
Simplified: Fourteen made their first official appearance : British Guiana ( now Guyana ) , Burma ( now Myanmar ) , Ceylon ( now Sri Lanka ) , Iran , Iraq , Jamaica , Korea , Lebanon , Pakistan , Puerto Rico , Singapore , Syria , Trinidad and Tobago , and Venezuela .