Complex sentence: The fleet changed course to the south however when the wind turned more to the north; it has been suggested that the initial move to the north was a feint and indeed James diverted some of his forces in that direction.
Split into simpler sentences: The fleet changed course to the south when the wind turned more to the north. It has been suggested that the initial move to the north was a feint, and indeed James diverted some of his forces in that direction.