Complex sentence: For 12 hours his crew fought off the Spanish, causing heavy damage to fifteen galleons; ultimately, Grenville wished to blow up the ship, but the crew surrendered, and he died several days later of his wounds.
Split into simpler sentences: For 12 hours his crew fought off the Spanish, causing heavy damage to fifteen galleons. Grenville was said to wish to blow up his ship, but the crew surrendered, and he died several days later of his wounds.