Complex sentence: A Black Loyalist named Richard Pierpoint, who was born about 1744 in Senegal and who had settled near present-day St. Catharines, Ontario, offered to organize a Corps of Men of Colour; this was refused but a white officer raised a small black corps.
Split into simpler sentences: A Black Loyalist named Richard Pierpoint, who was born about 1744 in Senegal and who had settled near present-day St. Catharines, Ontario, offered to organize a Corps of Men of Colour. This was refused but a white officer raised a small black corps.