Complex sentence: He finally managed to enter Japan, in 1622, turned in to the authorities by Chinese merchants when he was discovered on their ship, and imprisoned for two years at Ōmura, north of Nagasaki, while the Shogun deliberated over his case.
Split into simpler sentences: He finally managed to enter Japan in 1622 and was turned over to the authorities by Chinese merchants when he was discovered on their ship. He was imprisoned for two years at Ōmura, north of Nagasaki, while the Shogun deliberated on his case.