Complex sentence: The humanitarian principles underlying the sanatorium were deeply important to Golter, who worked to ensure that it was a democratic, non-sectarian institution, respecting the dignity of the patients who received free care, rather than viewing them as "charity" cases.
Split into simpler sentences: The humanitarian principles underlying the sanatorium were deeply important to Golter, who worked to ensure that it was a democratic, non-sectarian institution. It was important to respect the dignity of the patients who received free care, rather than viewing them as "charity" cases.