Complex sentence: The value of the coin varied in different centers but was highest in Halifax, with the result that, whenever the merchants of Prince Edward Island secured them, they sent them to Halifax, to take advantage of the higher rate.
Split into simpler sentences: The value of the coin varied in different centers but was highest in Halifax. Using this knowledge, whenever the merchants of Prince Edward Island (PEI) secured them, they sent them to Halifax, to take advantage of the higher rate.