Complex sentence: Both of African-American origin, Gamble and Huff have, both separately and together, written and produced over 170 gold and platinum records and were pioneers of Philadelphia soul and the in-house creative team for the Philadelphia International record label.
Split into simpler sentences: Both of African-American origin, Gamble and Huff have, both separately and together, written and produced over 170 gold and platinum records. They were pioneers of Philadelphia soul and the in-house creative team for the Philadelphia International record label.