Complex sentence: In 1865 Young bought out his business partners and built second and larger works at Addiewell, near West Calder, and in 1866 sold the concern to Young's Paraffin Light and Mineral Oil Company.
Split into simpler sentences: In 1865 Young bought out his business partners and built second and larger works at Addiewell, near West Calder. In 1866 Young sold the concern to Young's Paraffin Light and Mineral Oil Company.