Complex sentence: On 26 September 1580, Francis Drake sailed his ship into Plymouth Harbour with only 56 of the original crew of 80 left aboard, the ship was unloaded at Saltash Castle nearby where the treasure offloading was supervised by the Queens guards.
Split into simpler sentences: On 26 September 1580, Francis Drake sailed his ship into Plymouth Harbour with only 56 of the original crew of 80 left aboard. The ship was unloaded at Saltash Castle nearby where the treasure offloading was supervised by the Queens guards.