Complex sentence: The conference was attended by South African Ambassador to Ireland Melanie Verwoerd, the former South African Minister of Defence and Chief Negotiator Roelf Meyer who had led the talks on behalf of the South African National Party that ended Apartheid.
Split into simpler sentences: The conference was attended by South African Ambassador to Ireland Melanie Verwoerd and the former South African Minister of Defence and Chief Negotiator Roelf Meyer. Meyer had led the negotiations on behalf of the South African National Party that ended Apartheid.