Complex sentence: The social scene was once dominated by social clubs, which resembled college sororities and fraternities, but they have since died out publicly, but the sororities, such as the Baby Hospital sorority, are still active as secret societies.
Split into simpler sentences: The social scene was once dominated by social clubs, which resembled college sororities and fraternities, but they have since died out publicly. However, the sororities, such as the Baby Hospital sorority, are still active as secret societies.