Complex sentence: He made another globe in 1520, which some consider to show Antarctica, long before the officially known first discovery records, like the Piri Reis map (drawn in 1513), which some also say shows Antarctica.
Split into simpler sentences: He made another globe in 1520, which some consider to show Antarctica, way before the officially known first discovery records. Like the Piri Reis map, which was drawn in 1513, which some also say shows Antarctica.