Complex sentence: The "Toronto Star" published a letter to the editor from another Waterdown resident, who had an actual brain tumor, and who described the care she received in the Canadian health care system as being of "exceptional quality".
Split into simpler sentences: The "Toronto Star" published a letter to the editor from another Waterdown resident, who had a true brain tumor. She described the care she received in the Canadian health care system as being of "exceptional quality".