Complex sentence: While he was visiting the Apoxyomenos exhibition in Palazzo Medici Riccardi, Italian Education Minister Giuseppe Fioroni concluded that the model was left-handed based on his observation that the left shoulder muscles of the model are more developed than the ones on the right.
Split into simpler sentences: While he was visiting the Apoxyomenos exhibition in Palazzo Medici Riccardi, Italian Education Minister Giuseppe Fioroni concluded that the model was left-handed. He based this on his observation that the left shoulder muscles of the model are more developed than those on the right.