original_query: Who took a major part in organizing the relocation of approximately 1200 Black Loyalists to Africa?
  What is the most relevant chunk to answer the query?
query: Who took a major part in organizing the relocation of approximately 1200 Black Loyalists to Africa?
answer: John Clarkson, Thomas Clarkson's younger brother, played a major role in organizing the relocation of approximately 1200 Black Loyalists to Africa in 1792.