Complex sentence: Boston and Essex pianos are designed in the United States, but to take advantage of lower costs of production and labor, the pianos are made in Asia at non-Steinway factories under the supervision of Steinway employees.
Split into simpler sentences: Boston and Essex pianos are designed in the United States. To take advantage of lower costs of part production and labor, they are made in Asia at non-Steinway factories under the supervision of Steinway employees.