Original sentence: Since 1961, with the beginning of the colonial wars in its overseas territories, Portugal had begun to incorporate black Portuguese Africans in the war effort in Angola, Guinea-Bissau, and Mozambique based on concepts of multi-racialism and preservation of the empire
Edited sentence: After 1961, with the beginning of the colonial wars in its overseas territories, Portugal began to incorporate black Portuguese Africans into integrated units as part of the war effort in Angola, Guinea-Bissau, and Mozambique based on concepts of multi-racialism and preservation of the empire.Portugal had employed regular native troops (companhias indigenas) in its colonial army since the early nineteenth century