Complex sentence: By 1879, they were importing canned salmon from the John West company in Oregon, USA, the rights to use whose name they purchased in 1888; and the first shipments of John West Salmon appeared in 1892.
Split into simpler sentences: By 1879, they were importing canned salmon from the John West company in Oregon, USA, the rights to use whose name they purchased in 1888. The first shipments of John West Salmon appeared in 1892.