Complex sentence: Beilhart became friends with C. W. Post, who had been a patient at the sanitarium, but was healed by a Christian Science faith healer, Mrs. Elizabeth K. Gregory.
Split into simpler sentences: Beilhart became friends with C. W. Post, who had been a patient at the sanitarium. Post's health improved dramatically, however, while under the care of a Christian Science faith healer, Mrs. Elizabeth K. Gregory.