Complex sentence: In 1508, he joined Juan Ponce de León to explore Puerto Rico and prospect for gold, and in 1511, he fought under Ponce de León to repress the Caribs and the Taínos who had joined forces in Puerto Rico in a great revolt against the Spaniards.
Split into simpler sentences: In 1508, he joined Juan Ponce de León to explore Puerto Rico and prospect for gold. In 1511, he fought under Ponce de León to repress the Carib and the Taíno, who had joined forces in Puerto Rico in a great revolt against the Spaniards.