Complex sentence: Stonehenge Aotearoa also differs from its Salisbury cousin in construction; the pillars, lintels and central obelisk are not hewn stone, but are hollow structures with concrete molding forming their exterior.
Split into simpler sentences: Stonehenge Aotearoa also differs from its Salisbury cousin in construction. The pillars, lintels and central obelisk are not hewn stone, but are hollow structures with concrete molding forming their exterior.