Complex sentence: APOBEC3G and other proteins in the same family are able to act as activating induced cysteine deaminases (AID) cytidine deaminase, inducing numerous deoxcytidine to deoxyuridine hypermutations in the first strand negative strand of the HIV DNA primarily expressed as complimentary DNA (cDNA).
Split into simpler sentences: APOBEC3G and other proteins in the same family are able to act as Activation-Induced (Cytidine) Deaminases (AID). These proteins are able to induce numerous deoxycytidine to deoxyuridine mutations in the first strand negative strand of the HIV DNA primarily expressed as complimentary DNA (cDNA).