Complex sentence: In fact, intrinsic and sometimes "adverse effects" of a medical treatment are iatrogenic; for example, radiation therapy or chemotherapy, due to the needed aggressiveness of the therapeutic agents, frequent effects are hair loss, anemia, vomiting, nausea, brain damage.
Split into simpler sentences: In fact, intrinsic and sometimes "adverse effects" of a medical treatment are iatrogenic. For example, radiation therapy and chemotherapy, due to the needed aggressiveness of the therapeutic agents, frequently produce iatrogenic effects such as hair loss, anemia, vomiting, nausea, brain damage.