Complex sentence: In 1988, the first Bourbonnais was introduced in the USA, and since then the breed has been growing in this country, which became the second producer of Bourbonnais pointers after France.
Split into simpler sentences: In 1988, the first Bourbonnais was introduced in the USA. Since then the breed has been growing in that country, which became the second producer of Bourbonnais pointers after France.