Complex sentence: Two functions have been identified in AR that have critical roles in the regulation of target gene transactivation, the N-terminal activation function 1 (AF1) and the C-terminal activation function 2 (AF2).
Split into simpler sentences: Two functions have been identified in AR which has critical roles in the regulation of target gene transactivation. The N-terminal activation function 1 (AF1) and the C-terminal activation function 2 (AF2).