Complex sentence: When the foreign slave trade was closed off by the British in 1850, plantation owners began turning more and more to European immigrants to meet the demand of labor, but internal slave trade from the north continued until slavery was finally abolished in Brazil in 1888.
Split into simpler sentences: When the foreign slave trade was closed off by the British in 1850, plantation owners began turning more and more to European immigrants to meet the demand of labor. However, internal slave trade with the north continued until slavery was finally abolished in Brazil in 1888.