Complex sentence: The U.S. Forest Service (USFS) manages the property where the camp once was, not much is left, part of a gate and a handful of scattered shells of buildings, some of which have been fenced off and sealed with sheets of metal.
Split into simpler sentences: The U.S. Forest Service (USFS) manages the property where the camp once was. Not much is left: part of a gate and a handful of scattered shells of buildings, some of which have been fenced off and sealed with sheets of metal.