Complex sentence: Damage became remarkably widespread and catastrophic at and around the nearby St. John's Regional Medical Center, which lost many windows, interior walls, ceilings, and part of its roof; its life flight helicopter was also blown away and destroyed.
Split into simpler sentences: Damage became remarkably widespread and catastrophic at and around the nearby St. John's Regional Medical Center. The hospital lost many windows, interior walls, ceilings, and part of its roof, and its life flight helicopter was also blown away and destroyed.