Complex sentence: Despite suffering from sea-sickness William refused to go ashore and the fleet reassembled, having lost only one ship that grounded, though about a thousand crippled horses had been thrown into the sea.
Split into simpler sentences: Despite suffering from sea-sickness, William refused to go ashore. The fleet reassembled, having lost only one ship that grounded, though about a thousand crippled horses had been thrown into the sea.