Complex sentence: On 28 October 1914 the company was asked to build a plant capable of producing around five tons of TNT per week and after further negotiations a contract was signed on 26 November 1914.
Split into simpler sentences: On 28 October 1914 an offer was made to the company to build a plant capable of producing around five tons of TNT per week. Following further negotiations a contract was signed on 26 November 1914.