Complex sentence: According to historian Ricardo Alegria, the first free black man to set foot on the island in 1509 was Juan Garrido, a conquistador who belonged to Juan Ponce de León's entourage.
Split into simpler sentences: According to historian Ricardo Alegria, the first free black man set foot on the island in 1509. He was Juan Garrido, a conquistador who belonged to Juan Ponce de León's entourage.