Original sentence: The application of the term to situations other than apartheid in South Africa is controversial and disputed, because there is no agreed definition, and it is therefore regarded by many as a mere political epithet.The term apartheid commonly refers to South African apartheid, a former official policy of political, legal, and economic racial discrimination against nonwhites
Edited sentence: Since 1973, the United Nations has considered the crime of apartheid a crime against humanity.The application of the term to situations other than apartheid in South Africa is controversial and disputed, because there is no agreed definition, and it is therefore regarded by some as a mere political epithet.The term apartheid once referred only to South African apartheid, a former official policy of political, legal, and economic racial discrimination against nonwhites.The term has also come into general use to refer to any policy or practice involving the discriminatory separation of different groups