Complex sentence: On 11 July 1668 Morgan anchored short of his target and transferred his men to 23 canoes, where they moved to within of the target before landing and approaching the castle from the landward side, where they arrived half an hour before dawn.
Split into simpler sentences: On 11 July 1668 Morgan anchored short of his target and transferred his men to 23 canoes, where they paddled to within of the target. They landed and approached the castle from the landward side, where they arrived half an hour before dawn.