Complex sentence: During South Africa's rule under apartheid, the South African Police operated in close conjunction with the South African Defence Force to quell social unrest amongst the country's disenfranchised black majority.
Split into simpler sentences: During South Africa's rule under apartheid, the SAP functioned in close conjunction with the South African Defence Force. Apart from conventional police fuctions, the SAP was used to quell social unrest amongst the country's disenfranchised black majority.