Complex sentence: In 1947 the main coal mining division of the business was nationalised into the National Coal Board, the remainder of the company diversified, mainly into shipping and engineering, and acquired the ports of Tees and Hartlepool in the 1990s.
Split into simpler sentences: In 1947 the main coal mining division of the business was nationalised into the National Coal Board. The remainder of the company diversified, mainly into shipping and engineering, and acquired the ports of Tees and Hartlepool in the 1990s.