Complex sentence: Several of these made their way to New Orleans through trade and probably circulated in greater numbers after France regained the Louisiana territory from Spain in 1800 and continued to circulate in Louisiana after the United States purchased the territory in 1803.
Split into simpler sentences: Several of these made their way to New Orleans through trade. They probably circulated in greater numbers after France regained the Louisiana territory from Spain in 1800 and continued to circulate in Louisiana after the United States purchased the territory in 1803.