original: They were introduced to Europe in 1846 by Robert Fortune, collector for the London Horticultural Society, and shortly thereafter into North America.
simplifications: They were introduced to Europe in 1846 by Robert Fortune, collector for the London Horticultural Society.  Then they were introduced to North America. They were brought to Europe in 1846 by Robert Fortune. He is the collector for the London Horticultural Society, and after that they were brought to North America. Robert Fortune established them in Europe (1846). Later, he did the same in North America. He was a collector. He worked for the London Horticultural Society. They were brought to Europe in 1846 by Robert Fortune, a London Horticultural Society collector. Soon after, they were brought to North America. They were introduced to Europe in 1846 by Robert Fortune. He was a collector for the London Horticultural Society. Shortly after they went to North America. Robert Fortune, who was a collector for the London Horticultural Society introduced them to Europe in 1846, then to North America. They were brought to Europe in 1846 and to North America soon after. In 1846, they were introduced to Europe by Robert Fortune, a collector for the London Horticultural Society. Soon after they made their way into North America. Robert Fortune introduced them to Europe in 1846 and shortly thereafter into North America. Robert Fortune is a collector for the London Horticultural Society, They were brought to Europe in 1846 by Robert Fortune, collector for the London Horticultural Society, and shortly thereafter into North America.