Complex sentence: Azathioprine (AZA), also known by its brand name Imuran, is an immunosuppressive drug used in organ transplantation and autoimmune diseases and belongs to the chemical class of purine analogues.
Split into simpler sentences: Azathioprine (AZA), also known by its brand name Imuran, is an immunosuppressive drug used in organ transplantation and autoimmune diseases. It belongs to the chemical class of purine analogues.