Simplify the following text for a Grade 17 native English-speaking person.
Original: The African National Congress ( ANC ) has been South Africa 's governing left-wing political party , supported by its tripartite alliance with the Congress of South African Trade Unions ( COSATU ) and the South African Communist Party ( SACP ) , since the establishment of non-racial democracy in April 1994 .
Simplified: The African National Congress ( ANC ) , supported by the Congress of South African Trade Unions ( COSATU ) and the South African Communist Party ( SACP ) , has been South Africa 's governing left-wing political party since the establishment of non-racial democracy in April 1994 .