Complex sentence: Worlebury Camp is the name of the place where an Iron Age hill fort once stood atop Worlebury Hill, which is north of the town of Weston-super-Mare in Somerset, England.
Split into simpler sentences: Worlebury Camp is the name of the place where an Iron Age hill fort once stood atop Worlebury Hill. Worlebury hill is just north of Weston-super-Mare, which is itself in Somerset, England.