Complex sentence: The temple treasure (now long vanished) included a cult statue of Venus, as well as statues of Caesar and Cleopatra; numerous works of art, including Greek paintings; six collections of engraved gems; and a breastplate decorated with pearls from Britannia.
Split into simpler sentences: The temple treasure (now long vanished) included a statue of Venus, as well as statues of Julius Caesar. Numerous works of art, including Greek paintings; six collections of engraved gems; and a breastplate decorated with pearls from Britannia.