Complex sentence: There were other Black Africans in Ireland who were not slaves, notably Olaudah Equiano (also spelled Olauda Ikwuano), who visited Belfast once from London, but wrote and self-published best selling accounts of his experience of slavery.
Split into simpler sentences: There were other Black Africans in Ireland who were not slaves, notably Olaudah Equiano (also spelled Olauda Ikwuano), who visited Belfast once from London. Equiano wrote and self-published best selling accounts of his experience of slavery.