Complex sentence: The "university" was reportedly originally known as the College of Drugless Healing, which was traced by the United States government to a residential dwelling on Melrose Avenue, operating strictly through a post office box and delivering mail-order doctorates without classes or exams.
Split into simpler sentences: The "university" was said to have originally been known as the College of Drugless Healing, which was traced by the United States government to a residential dwelling on Melrose Avenue. It operated strictly through a post office box and delivered mail-order doctorates without classes or exams.