Complex sentence: But about 70 of the 6th-century BC Archaic metope reliefs on the temple and (probably) the temple treasury nearby were recovered, and form the centrepiece of the Paestum museum, set in place around walls of the original height.
Split into simpler sentences: But about 70 of the 6th-century BC Archaic metope reliefs on the temple and (probably) the temple treasury nearby were recovered. The earlier cycle forms the centrepiece of the Paestum museum, set in place around walls of the original height.